deps: update dependency com.google.cloud:google-cloud-shared-dependencies to v0.20.0 (#917)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-shared-dependencies](https://togithub.com/googleapis/java-shared-dependencies) | `0.19.0` -> `0.20.0` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-shared-dependencies/0.20.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-shared-dependencies/0.20.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-shared-dependencies/0.20.0/compatibility-slim/0.19.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-shared-dependencies/0.20.0/confidence-slim/0.19.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>googleapis/java-shared-dependencies</summary>

### [`v0.20.0`](https://togithub.com/googleapis/java-shared-dependencies/blob/master/CHANGELOG.md#&#8203;0200-httpswwwgithubcomgoogleapisjava-shared-dependenciescompare0190v0200-2021-02-25)

[Compare Source](https://togithub.com/googleapis/java-shared-dependencies/compare/v0.19.0...v0.20.0)

##### Dependencies

-   update dependency com.google.auth:google-auth-library-bom to v0.24.0 ([#&#8203;284](https://www.github.com/googleapis/java-shared-dependencies/issues/284)) ([5e4914c](https://www.github.com/googleapis/java-shared-dependencies/commit/5e4914cc4a8ccd41a219f150a7455da116d1594b))
-   update dependency com.google.http-client:google-http-client-bom to v1.39.0 ([#&#8203;288](https://www.github.com/googleapis/java-shared-dependencies/issues/288)) ([70bb862](https://www.github.com/googleapis/java-shared-dependencies/commit/70bb862029b840fbd99ba0109fa2b8f585812793))
-   update dependency com.google.protobuf:protobuf-bom to v3.15.1 ([#&#8203;282](https://www.github.com/googleapis/java-shared-dependencies/issues/282)) ([44283bd](https://www.github.com/googleapis/java-shared-dependencies/commit/44283bdfdc9288b4a8d16b6ed3a61541792d147e))
-   update dependency com.google.protobuf:protobuf-bom to v3.15.2 ([#&#8203;287](https://www.github.com/googleapis/java-shared-dependencies/issues/287)) ([bdae560](https://www.github.com/googleapis/java-shared-dependencies/commit/bdae5600f9033219ef8beb6c4d1c521fb062eaec))
-   update dependency io.grpc:grpc-bom to v1.36.0 ([#&#8203;285](https://www.github.com/googleapis/java-shared-dependencies/issues/285)) ([c59771b](https://www.github.com/googleapis/java-shared-dependencies/commit/c59771b2436ac1a4fbc92b48049900472dd6d3ff))
-   update gax.version to v1.62.0 ([#&#8203;291](https://www.github.com/googleapis/java-shared-dependencies/issues/291)) ([66bd070](https://www.github.com/googleapis/java-shared-dependencies/commit/66bd0702bd3deb64e0f6c73635e0ffd51a4d637e))
-   update google.common-protos.version to v2.1.0 ([#&#8203;289](https://www.github.com/googleapis/java-shared-dependencies/issues/289)) ([43c9f02](https://www.github.com/googleapis/java-shared-dependencies/commit/43c9f026b1fa82f38dcb93b902281c2559e82d8e))
-   update iam.version to v1.0.9 ([#&#8203;281](https://www.github.com/googleapis/java-shared-dependencies/issues/281)) ([ee44d0b](https://www.github.com/googleapis/java-shared-dependencies/commit/ee44d0b41e101931ccf5de2561dfcfcc9ff88b88))

</details>

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pom.xml

@@ -63,7 +63,7 @@
     <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
     <github.global.server>github</github.global.server>
     <site.installationModule>google-cloud-spanner-parent</site.installationModule>
-    <google.cloud.shared-dependencies.version>0.19.0</google.cloud.shared-dependencies.version>
+    <google.cloud.shared-dependencies.version>0.20.0</google.cloud.shared-dependencies.version>
   </properties>
 
   <dependencyManagement>