Update docker.elastic.co/kibana/kibana Docker tag to v8.15.2

[renovate]

This PR contains the following updates:

Package	Update	Change
docker.elastic.co/kibana/kibana (source)	patch	8.15.0 -> 8.15.2

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Release Notes

elastic/kibana (docker.elastic.co/kibana/kibana)

v8.15.2: Kibana 8.15.2

Compare Source

Downloads: https://elastic.co/downloads/kibana
Release notes: https://www.elastic.co/guide/en/kibana/8.15/release-notes-8.15.2.html

v8.15.1: Kibana 8.15.1

Compare Source

Downloads: https://elastic.co/downloads/kibana
Release notes: https://www.elastic.co/guide/en/kibana/8.15/release-notes-8.15.1.html

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