Update docker.elastic.co/elasticsearch/elasticsearch Docker tag to v8.15.0

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
docker.elastic.co/elasticsearch/elasticsearch (source)	minor	8.14.3 -> 8.15.0

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Release Notes

elastic/elasticsearch (docker.elastic.co/elasticsearch/elasticsearch)

### [`v8.15.0`](https://togithub.com/elastic/elasticsearch/releases/tag/v8.15.0): Elasticsearch 8.15.0 [Compare Source](https://togithub.com/elastic/elasticsearch/compare/v8.14.3...v8.15.0) Downloads: https://elastic.co/downloads/elasticsearch Release notes: https://www.elastic.co/guide/en/elasticsearch/reference/8.15/release-notes-8.15.0.html

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