[8.15](backport #41186) fix: restore stderr logs when running on docker or systemd environments

[mergify]

Proposed commit message

This PR updates elastic-agent-libs to the latest version in order to fix #41118.

Author's Checklist

• Review the changes in elastic-agent-libs between v0.11.0...v0.12.1 and make sure there is no breaking changes added.

How to test this PR locally

cd filebeat
mage build
timeout 3 filebeat --environment docker

# filebeat json logs appear in the stderr

Related issues

• Relates to Beats do not log to stderr when running in a container or systemd environment #41118

---

This is an automatic backport of pull request #41186 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of f369a28 has failed:

On branch mergify/bp/8.15/pr-41186
Your branch is up to date with 'origin/8.15'.

You are currently cherry-picking commit f369a281c1.
  (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:   NOTICE.txt
	both modified:   go.mod
	both modified:   go.sum

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

[elasticmachine]

Pinging @elastic/elastic-agent-data-plane (Team:Elastic-Agent-Data-Plane)

[mauri870]

Need to fix conflicts.

[mauri870]

FYI since this is a backport to 8.15 this PR bumps elastic-agent-libs from v0.9.3 to v0.12.1, here is the diff for context elastic/elastic-agent-libs@v0.9.3...v0.12.1.