[8.13](backport #38743) [7.17] Fix Python systems tests with forked docker-compose package

[mergify]

This is a manual backport of the fix for the Python systems tests contained in #38199, which uses a fork of the docker-compose Python package as a work around.

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This is an automatic backport of pull request #38743 done by Mergify.

[mergify]

Cherry-pick of 33b776a has failed:

On branch mergify/bp/8.13/pr-38743
Your branch is up to date with 'origin/8.13'.

You are currently cherry-picking commit 33b776a1b9.
  (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:   libbeat/tests/system/requirements.txt
	both modified:   libbeat/tests/system/requirements_aix.txt
	both modified:   metricbeat/Dockerfile

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

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