[docker] Update docker.elastic.co/elasticsearch/elasticsearch Docker tag to v8.19.20

[renovate]

This PR contains the following updates:

Package	Update	Change
docker.elastic.co/elasticsearch/elasticsearch (source)	patch	8.19.19 → 8.19.20

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Release Notes

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

v8.19.20: Elasticsearch 8.19.20

Compare Source

Downloads: https://elastic.co/downloads/elasticsearch
Release notes: https://www.elastic.co/guide/en/elasticsearch/reference/8.19/release-notes-8.19.20.html

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Pull request overview

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Updates the Docker Compose stack to use a newer Elasticsearch Docker image tag.

Changes:

• Bumped the elasticsearch service image from 8.19.19 to 8.19.20.

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