build(deps): bump org.opensearch.client:spring-data-opensearch-starter

Bumps [org.opensearch.client:spring-data-opensearch-starter](https://github.com/opensearch-project/spring-data-opensearch) from 1.5.4 to 1.6.0.
- [Release notes](https://github.com/opensearch-project/spring-data-opensearch/releases)
- [Commits](opensearch-project/spring-data-opensearch@v1.5.4...v1.6.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

embedded-opensearch/pom.xml

@@ -13,7 +13,7 @@
     <artifactId>embedded-opensearch</artifactId>
 
     <properties>
-        <spring-data-opensearch-starter.version>1.5.4</spring-data-opensearch-starter.version>
+        <spring-data-opensearch-starter.version>1.6.0</spring-data-opensearch-starter.version>
         <opensearch-testcontainers.version>2.1.2</opensearch-testcontainers.version>
     </properties>