Release 2.12.0 release notes (#576)

Signed-off-by: Prudhvi Godithi <[email protected]>
(cherry picked from commit 1e052fb)
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

release-notes/opensearch.job-scheduler.release-notes-2.12.0.0.md

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+## Version 2.12.0.0 Release Notes
+
+Compatible with OpenSearch 2.12.0
+
+### Maintenance
+* Fix flaky tests ([#556](https://github.com/opensearch-project/job-scheduler/pull/556)).
+* Use the build CI image in the Build and Test workflow ([#534](https://github.com/opensearch-project/job-scheduler/pull/534)).
+* Upgrade gradle to 8.5 ([#545](https://github.com/opensearch-project/job-scheduler/pull/545)).
+* Update release-drafter/release-drafter from 5 to 6 ([#567](https://github.com/opensearch-project/job-scheduler/pull/567)).
+* Update  peter-evans/create-issue-from-file from 4 to 5 ([#566](https://github.com/opensearch-project/job-scheduler/pull/566)).
+* Update `org.slf4j:slf4j-api` from 2.0.7 to 2.0.11 ([#570](https://github.com/opensearch-project/job-scheduler/pull/570)).
+* Update `com.google.googlejavaformat:google-java-format` from 1.17.0 to 1.19.2 ([#555](https://github.com/opensearch-project/job-scheduler/pull/555)).
+* Update `com.google.guava:guava` from 32.1.2-jre to 32.1.3-jre ([#530](https://github.com/opensearch-project/job-scheduler/pull/530)).
+* Update `com.google.guava:failureacces`s from 1.0.1 to 1.0.2 ([#532](https://github.com/opensearch-project/job-scheduler/pull/532)).
+* Update `com.netflix.nebula.ospackage` from 11.5.0 to 11.6.0 ([#551](https://github.com/opensearch-project/job-scheduler/pull/551)).
+* Update `com.diffplug.spotless` from 6.22.0 to 6.25.0 ([#558](https://github.com/opensearch-project/job-scheduler/pull/558)).
+* Fix backport workflow ([#533](https://github.com/opensearch-project/job-scheduler/pull/533)).