Downgrade required version for psutil to 5.5.1 (backport #453)

[mergify]

This is an automatic backport of pull request #453 done by Mergify.
Cherry-pick of 4f13f89 has failed:

On branch mergify/bp/master/pr-453
Your branch is up to date with 'origin/master'.

You are currently cherry-picking commit 4f13f89.
  (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)

Changes to be committed:
	modified:   pyproject.toml

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

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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[y0urself]

this is still not 100% fixed?