build(deps): bump elasticsearch/elasticsearch from 8.15.0 to 8.16.0

Bumps [elasticsearch/elasticsearch](https://github.com/elastic/elasticsearch-php) from 8.15.0 to 8.16.0.
- [Release notes](https://github.com/elastic/elasticsearch-php/releases)
- [Changelog](https://github.com/elastic/elasticsearch-php/blob/main/CHANGELOG.md)
- [Commits](elastic/elasticsearch-php@v8.15.0...v8.16.0)

---
updated-dependencies:
- dependency-name: elasticsearch/elasticsearch
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]