Bump org.opensearch.client:opensearch-java from 2.15.0 to 2.16.0 (#360)

Bumps [org.opensearch.client:opensearch-java](https://github.com/opensearch-project/opensearch-java) from 2.15.0 to 2.16.0.
- [Release notes](https://github.com/opensearch-project/opensearch-java/releases)
- [Changelog](https://github.com/opensearch-project/opensearch-java/blob/v2.16.0/CHANGELOG.md)
- [Commits](opensearch-project/opensearch-java@v2.15.0...v2.16.0)

---
updated-dependencies:
- dependency-name: org.opensearch.client:opensearch-java
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

settings.gradle.kts

@@ -33,7 +33,7 @@ dependencyResolutionManagement {
 
     create("opensearchLibs") {
       version("opensearch", "2.17.1")
-      library("java-client", "org.opensearch.client:opensearch-java:2.15.0")
+      library("java-client", "org.opensearch.client:opensearch-java:2.16.0")
       library("client", "org.opensearch.client", "opensearch-rest-client").versionRef("opensearch")
       library("high-level-client", "org.opensearch.client", "opensearch-rest-high-level-client").versionRef("opensearch")
       library("sniffer", "org.opensearch.client", "opensearch-rest-client-sniffer").versionRef("opensearch")