Bump to version 1.2

[jackiehanyang]

CI/CD

• Increment version on main to 1.2.0.0.
• Ensure working and passing CI.

[jackiehanyang]

Current error when try to upgrade version to 1.2

* What went wrong:
Could not determine the dependencies of task ':opensearch-ml-plugin:thirdPartyAudit'.
> Could not resolve all files for configuration ':opensearch-ml-plugin:runtimeClasspath'.

   > Could not find org.opensearch:common-utils:1.2.0.0.

[ylwu-amzn]

Try

1. Add maven repo maven { url "https://aws.oss.sonatype.org/content/repositories/snapshots" }
2. Use opensearch_version = "1.2.0-SNAPSHOT" and common_utils_version = '1.2.0.0-SNAPSHOT'

./gradlew build passed locally , check this commit

[jackiehanyang]

The issue is I missed the repositories setting file which is is located in a separate file and applied to build.gradle file. After addressing this, building 1.2 version with downloading dependencies SNAPSHOTs from Maven passed successfully.

Version bumping PR - #90

[jackiehanyang]

Need to look into why Checks in PR are somehow not getting triggered, It will be triggered by push though.