[FEATURE] Set opensearch-learning-to-rank-base plugin 3.0.0 baseline JDK version to JDK-23

[rithin-pullela-aws]

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Set opensearch-learning-to-rank-base plugin 3.0.0 baseline JDK version to JDK-21

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[rithin-pullela-aws]

Created this issue in response to:
opensearch-project/opensearch-build#5245

Core supports JDK 23 opensearch-project/OpenSearch#16255

[rithin-pullela-aws]

Also need to add LTR to the manifests/3.0.0/opensearch-3.0.0.yml and manifests/3.0.0/opensearch-3.0.0-test.yml after JDK 23 is supported.