[updatecli] update elastic stack version for testing 9.2.1-079cebdc

[github-actions]

Bump elastic-stack to latest snapshot version

Update snapshot.yml

1 file(s) updated with "$1:9.2.1-079cebdc-SNAPSHOT": * testing/environments/snapshot.yml

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[mergify]

Automatically approving mergify

[mergify]

This pull request has been removed from the queue for the following reason: checks failed.

The merge conditions cannot be satisfied due to failing checks:

• ❌ buildkite/beats

You can check the last failing draft PR here: #47357.

You may have to fix your CI before adding the pull request to the queue again.
If you update this pull request, to fix the CI, it will automatically be requeued once the queue conditions match again.
If you think this was a flaky issue instead, you can requeue the pull request, without updating it, by posting a @mergifyio requeue comment.