[8.x] [updatecli] Bump elastic stack version to 9.0.0-862b23c2 (backport #14447)

[mergify]

What

Bump elastic stack version to 9.0.0-862b23c2

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Bump elastic-stack to latest snapshot version

Update docker-compose.yml

1 file(s) updated with "$1:9.0.0-862b23c2-SNAPSHOT": * docker-compose.yml

Update k8s stack yaml files

3 file(s) updated with "version: 9.0.0-862b23c2-SNAPSHOT": * testing/infra/k8s/base/stack/apm-server.yaml * testing/infra/k8s/base/stack/elasticsearch.yaml * testing/infra/k8s/base/stack/kibana.yaml

GitHub Action workflow link

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This is an automatic backport of pull request #14447 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 21e1276 has failed:

On branch mergify/bp/8.x/pr-14447
Your branch is up to date with 'origin/8.x'.

You are currently cherry-picking commit 21e1276f3.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   docker-compose.yml
	both modified:   testing/infra/k8s/base/stack/apm-server.yaml
	both modified:   testing/infra/k8s/base/stack/elasticsearch.yaml
	both modified:   testing/infra/k8s/base/stack/kibana.yaml

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[kruskall]

🤔