chore(deps): update docker.elastic.co/elasticsearch/elasticsearch docker tag to v7.17.6

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
docker.elastic.co/elasticsearch/elasticsearch	patch	7.17.5 -> 7.17.6

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Release Notes

elastic/elasticsearch

### [`v7.17.6`](https://togithub.com/elastic/elasticsearch/releases/tag/v7.17.6) [Compare Source](https://togithub.com/elastic/elasticsearch/compare/v7.17.5...v7.17.6) Downloads: https://elastic.co/downloads/elasticsearch Release notes: https://www.elastic.co/guide/en/elasticsearch/reference/7.17/release-notes-7.17.6.html

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