[7.17](backport #37033) Bump urllib3 from 1.26.5 to 1.26.18 in /libbeat/tests/system

[mergify]

This is an automatic backport of pull request #37033 done by Mergify.
Cherry-pick of 3bc0d1f has failed:

On branch mergify/bp/7.17/pr-37033
Your branch is up to date with 'origin/7.17'.

You are currently cherry-picking commit 3bc0d1f7cb.
  (fix conflicts and run "git cherry-pick --continue")
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Changes to be committed:
	modified:   libbeat/tests/system/requirements.txt
	modified:   libbeat/tests/system/requirements_aix.txt

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   pytest.ini

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

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