Fix GA workflow that publishes Apache Maven artifacts

[reta]

Description

Fix GA workflow that publishes Apache Maven artifacts:

* What went wrong:
Execution failed for task ':opensearch-ml-common:compileJava'.
> error: invalid source release: 21

Issues Resolved

Part of #2503

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[reta]

Created an issue for CI image: opensearch-project/opensearch-ci#436

[reta]

@dhrubo-os the publishing failed with:

* What went wrong:
Execution failed for task ':opensearch-ml-common:publishShadowPublicationToSnapshotsRepository'.
> Failed to publish publication 'shadow' to repository 'Snapshots'
   > Could not PUT 'https://aws.oss.sonatype.org/content/repositories/snapshots/org/opensearch/opensearch-ml-common/3.0.0.0-SNAPSHOT/opensearch-ml-common-3.0.0.0-20240709.232313-235.jar'. Received status code 401 from server: Content access is protected by token

[dhrubo-os]

@dhrubo-os the publishing failed with:

* What went wrong:
Execution failed for task ':opensearch-ml-common:publishShadowPublicationToSnapshotsRepository'.
> Failed to publish publication 'shadow' to repository 'Snapshots'
   > Could not PUT 'https://aws.oss.sonatype.org/content/repositories/snapshots/org/opensearch/opensearch-ml-common/3.0.0.0-SNAPSHOT/opensearch-ml-common-3.0.0.0-20240709.232313-235.jar'. Received status code 401 from server: Content access is protected by token

@peterzhuamazon Do you have any suggestion on this?

[b4sjoo]

@reta Does this PR need to be backported to 2.x?

[reta]

@reta Does this PR need to be backported to 2.x?

I am pretty sure we need, yes, thanks @b4sjoo !