Bump org.elasticsearch.client:elasticsearch-rest-client

Bumps [org.elasticsearch.client:elasticsearch-rest-client](https://github.com/elastic/elasticsearch) from 8.15.1 to 8.16.1.
- [Release notes](https://github.com/elastic/elasticsearch/releases)
- [Changelog](https://github.com/elastic/elasticsearch/blob/main/CHANGELOG.md)
- [Commits](elastic/elasticsearch@v8.15.1...v8.16.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

modules/elasticsearch/build.gradle

@@ -2,7 +2,7 @@ description = "Testcontainers :: elasticsearch"
 
 dependencies {
     api project(':testcontainers')
-    testImplementation "org.elasticsearch.client:elasticsearch-rest-client:8.15.1"
+    testImplementation "org.elasticsearch.client:elasticsearch-rest-client:8.16.1"
     testImplementation "org.elasticsearch.client:transport:7.17.24"
     testImplementation 'org.assertj:assertj-core:3.26.3'
 }