Bump elastic.version in /log4j-layout-template-json-test

Bumps `elastic.version` from 9.1.3 to 9.1.5.

Updates `co.elastic.clients:elasticsearch-java` from 9.1.3 to 9.1.5
- [Release notes](https://github.com/elastic/elasticsearch-java/releases)
- [Changelog](https://github.com/elastic/elasticsearch-java/blob/main/CHANGELOG.md)
- [Commits](elastic/elasticsearch-java@v9.1.3...v9.1.5)

Updates `org.elasticsearch.client:elasticsearch-rest-client` from 9.1.3 to 9.1.5
- [Release notes](https://github.com/elastic/elasticsearch/releases)
- [Changelog](https://github.com/elastic/elasticsearch/blob/main/CHANGELOG.md)
- [Commits](elastic/elasticsearch@v9.1.3...v9.1.5)

---
updated-dependencies:
- dependency-name: co.elastic.clients:elasticsearch-java
  dependency-version: 9.1.5
  dependency-type: direct:development
  update-type: version-update:semver-patch
- dependency-name: org.elasticsearch.client:elasticsearch-rest-client
  dependency-version: 9.1.5
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

log4j-layout-template-json-test/pom.xml

@@ -48,7 +48,7 @@
          2. The Docker image version of the ELK-stack
 
          As of 2024-09-16, these all (Maven artifacts and Elastic products) get released with the same version. -->
-    <elastic.version>9.1.3</elastic.version>
+    <elastic.version>9.1.5</elastic.version>
 
   </properties>