2.18.0 release notes (#690)

Signed-off-by: Prudhvi Godithi <[email protected]>

release-notes/opensearch-job-scheduler.release-notes-2.18.0.0.md

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+## Version 2.18.0.0
+
+Compatible with OpenSearch 2.18.0
+
+### Maintenance
+* Increment version to 2.18.0 [#676](https://github.com/opensearch-project/job-scheduler/pull/676).
+* dependabot: bump org.gradle.test-retry from 1.5.10 to 1.6.0 [(#679)](https://github.com/opensearch-project/job-scheduler/pull/679) [(#681)](https://github.com/opensearch-project/job-scheduler/pull/681).
+* dependabot: bump com.google.googlejavaformat:google-java-format [(#684)](https://github.com/opensearch-project/job-scheduler/pull/684) [(#685)](https://github.com/opensearch-project/job-scheduler/pull/685).
+* Gradle upgrade to 8.10.2 and run CI checks with JDK 23 [(#688)](https://github.com/opensearch-project/job-scheduler/pull/688) [(#689)](https://github.com/opensearch-project/job-scheduler/pull/689).
+
+### Bug Fixes
+* * Return lockService from createComponents [(#670)](https://github.com/opensearch-project/job-scheduler/pull/670) [(#672)](https://github.com/opensearch-project/job-scheduler/pull/672).
+