[WIP] try making darker_lint experimental

[IAlibay]

This might at least avoid things looking like they failed (we can clean up the actions later if it works).

PR Checklist

• Tests?
• Docs?
• CHANGELOG updated?
• Issue raised/referenced?

[codecov]

Codecov Report

Base: 93.49% // Head: 93.49% // No change to project coverage 👍

Coverage data is based on head (272f113) compared to base (8d43073).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #3990   +/-   ##
========================================
  Coverage    93.49%   93.49%           
========================================
  Files          190      190           
  Lines        24963    24963           
  Branches      3527     3527           
========================================
  Hits         23338    23338           
  Misses        1102     1102           
  Partials       523      523           

Impacted Files	Coverage Δ
package/MDAnalysis/analysis/base.py	96.94% <100.00%> (ø)

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[IAlibay]

It's unclear to me if it's working :/ it definitely still does big X marks for PRs though...