build(deps): bump org.opensearch:opensearch-testcontainers

Bumps [org.opensearch:opensearch-testcontainers](https://github.com/opensearch-project/opensearch-testcontainers) from 2.1.3 to 4.0.0.
- [Release notes](https://github.com/opensearch-project/opensearch-testcontainers/releases)
- [Commits](opensearch-project/opensearch-testcontainers@v2.1.3...v4.0.0)

---
updated-dependencies:
- dependency-name: org.opensearch:opensearch-testcontainers
  dependency-version: 4.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

embedded-opensearch/pom.xml

@@ -15,7 +15,7 @@
 
     <properties>
         <spring-data-opensearch-starter.version>1.8.1</spring-data-opensearch-starter.version>
-        <opensearch-testcontainers.version>2.1.3</opensearch-testcontainers.version>
+        <opensearch-testcontainers.version>4.0.0</opensearch-testcontainers.version>
     </properties>
 
     <dependencies>