[aws] Update ECS to 1.12

[marc-gr]

Automated PR.

Updates ECS to v1.12 and does the required changes to the package.

[elasticmachine]

Pinging @elastic/integrations (Team:Integrations)

[elasticmachine]

💚 Build Succeeded

the below badges are clickable and redirect to their specific view in the CI or DOCS

Expand to view the summary

Build stats

• Start Time: 2021-09-30T08:32:47.046+0000

• Duration: 13 min 1 sec

• Commit: 8383903

Test stats 🧪

Test	Results
Failed	0
Passed	255
Skipped	1
Total	256

🤖 GitHub comments

To re-run your PR in the CI, just comment with:

• /test : Re-trigger the build.