Co-authored-by: larkee <larkee@users.noreply.github.com>

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This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [google-cloud-spanner](https://togithub.com/googleapis/python-spanner) | major | `==2.1.0` -> `==3.0.0` |

---

### Release Notes

<details>
<summary>googleapis/python-spanner</summary>

### [`v3.0.0`](https://togithub.com/googleapis/python-spanner/blob/master/CHANGELOG.md#&#8203;300-httpswwwgithubcomgoogleapispython-spannercomparev210v300-2021-01-15)

[Compare Source](https://togithub.com/googleapis/python-spanner/compare/v2.1.0...v3.0.0)

##### ⚠ BREAKING CHANGES

-   convert operations pbs into Operation objects when listing operations ([#&#8203;186](https://togithub.com/googleapis/python-spanner/issues/186))

##### Features

-   add support for instance labels ([#&#8203;193](https://www.github.com/googleapis/python-spanner/issues/193)) ([ed462b5](https://www.github.com/googleapis/python-spanner/commit/ed462b567a1a33f9105ffb37ba1218f379603614))
-   add support for ssl credentials; add throttled field to UpdateDatabaseDdlMetadata ([#&#8203;161](https://www.github.com/googleapis/python-spanner/issues/161)) ([2faf01b](https://www.github.com/googleapis/python-spanner/commit/2faf01b135360586ef27c66976646593fd85fd1e))
-   adding missing docstrings for functions & classes  ([#&#8203;188](https://www.github.com/googleapis/python-spanner/issues/188)) ([9788cf8](https://www.github.com/googleapis/python-spanner/commit/9788cf8678d882bd4ccf551f828050cbbb8c8f3a))
-   autocommit sample ([#&#8203;172](https://www.github.com/googleapis/python-spanner/issues/172)) ([4ef793c](https://www.github.com/googleapis/python-spanner/commit/4ef793c9cd5d6dec6e92faf159665e11d63762ad))

##### Bug Fixes

-   convert operations pbs into Operation objects when listing operations ([#&#8203;186](https://www.github.com/googleapis/python-spanner/issues/186)) ([ed7152a](https://www.github.com/googleapis/python-spanner/commit/ed7152adc37290c63e59865265f36c593d9b8da3))
-   Convert PBs in system test cleanup ([#&#8203;199](https://www.github.com/googleapis/python-spanner/issues/199)) ([ede4343](https://www.github.com/googleapis/python-spanner/commit/ede4343e518780a4ab13ae83017480d7046464d6))
-   **dbapi:** autocommit enabling fails if no transactions begun ([#&#8203;177](https://www.github.com/googleapis/python-spanner/issues/177)) ([e981adb](https://www.github.com/googleapis/python-spanner/commit/e981adb3157bb06e4cb466ca81d74d85da976754))
-   **dbapi:** executemany() hiding all the results except the last ([#&#8203;181](https://www.github.com/googleapis/python-spanner/issues/181)) ([020dc17](https://www.github.com/googleapis/python-spanner/commit/020dc17c823dfb65bfaacace14d2c9f491c97e11))
-   **dbapi:** Spanner protobuf changes causes KeyError's ([#&#8203;206](https://www.github.com/googleapis/python-spanner/issues/206)) ([f1e21ed](https://www.github.com/googleapis/python-spanner/commit/f1e21edbf37aab93615fd415d61f829d2574916b))
-   remove client side gRPC receive limits ([#&#8203;192](https://www.github.com/googleapis/python-spanner/issues/192)) ([90effc4](https://www.github.com/googleapis/python-spanner/commit/90effc4d0f4780b7a7c466169f9fc1e45dab8e7f))
-   Rename to fix "Mismatched region tag" check ([#&#8203;201](https://www.github.com/googleapis/python-spanner/issues/201)) ([c000ec4](https://www.github.com/googleapis/python-spanner/commit/c000ec4d9b306baa0d5e9ed95f23c0273d9adf32))

##### Documentation

-   homogenize region tags ([#&#8203;194](https://www.github.com/googleapis/python-spanner/issues/194)) ([1501022](https://www.github.com/googleapis/python-spanner/commit/1501022239dfa8c20290ca0e0cf6a36e9255732c))
-   homogenize region tags pt 2 ([#&#8203;202](https://www.github.com/googleapis/python-spanner/issues/202)) ([87789c9](https://www.github.com/googleapis/python-spanner/commit/87789c939990794bfd91f5300bedc449fd74bd7e))
-   update CHANGELOG breaking change comment ([#&#8203;180](https://www.github.com/googleapis/python-spanner/issues/180)) ([c7b3b9e](https://www.github.com/googleapis/python-spanner/commit/c7b3b9e4be29a199618be9d9ffa1d63a9d0f8de7))

</details>

---

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Co-authored-by: larkee <larkee@users.noreply.github.com>

…#217)

b/173067462

It seems 30 seconds are too short for mtls test (which uses the system test, and runs on an internal platform). This makes the mtls test very flaky. This PR introduces a `SPANNER_OPERATION_TIMEOUT_IN_SECONDS` env var to make the timeout configurable. 

The default value is now 60 seconds.

The assertions for credential scope in the `client` unit tests were broken by [a PR in the auth library](googleapis/google-auth-library-python#665). This does raise the question of whether we should be asserting the scopes like this in this library.

This PR fixes the assertions. Removal of these assertions can be done in a separate PR if it is decided they don't belong in this library.

This PR was generated using Autosynth. 🌈

Synth log will be available here:
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PiperOrigin-RevId: 354996675
Source-Link: googleapis/googleapis@20712b8
PiperOrigin-RevId: 352816749
Source-Link: googleapis/googleapis@ceaaf31
PiperOrigin-RevId: 350246057
Source-Link: googleapis/googleapis@5206824

…t tests (#228)

* fix: use datetime timezone when generating timestamp strings

* style: fix lint

Co-authored-by: larkee <larkee@users.noreply.github.com>

* feat: add PITR-lite support

* fix: remove unneeded conversion for earliest_version_time

* test: fix list_databases list comprehension

* feat: add support for PITR-lite backups (#1)

* Backup changes

* Basic tests

* Add system tests

* Fix system tests

* Add retention period to backup systests

* style: fix lint errors

* test: fix failing backup system tests (#2)

* Remove unnecessary retention period setting

* Fix systests

* Review changes (#3)

* Remove unnecessary retention period setting

* Fix systests

* Review changes

* style: fix lint

Co-authored-by: larkee <larkee@users.noreply.github.com>
Co-authored-by: Zoe <zoc@google.com>

This PR fixes the assertion to use `metadata.backup_info.version_time` instead of `metadata.backup_info.create_time`. It looks it was passing before the backend correctly supported it and I forgot to re-run the tests before merging #148 (whoops!) and so it is currently failing and preventing #205 from being merged:
https://source.cloud.google.com/results/invocations/8f0f5dab-1b35-4ce3-bb72-0ce9e79ab89d/targets/cloud-devrel%2Fclient-libraries%2Fpython%2Fgoogleapis%2Fpython-spanner%2Fpresubmit%2Fpresubmit/log

* feat: add support for logging commit stats

* test: add commit stats to CommitResponse

* style: fix lint errors

* refactor: remove log formatting

* test: update info arg assertions

* docs: document logger param

* refactor: pass CommitStats via extra kwarg

* fix: ensure logger is unused if commit fails

Co-authored-by: larkee <larkee@users.noreply.github.com>

* perf: improve streaming performance by using raw pbs

* refactor: remove unused import

Co-authored-by: larkee <larkee@users.noreply.github.com>

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>