Stop checking STATICFILES_DIRS with Django 4 or better

[matthiask]

Django 4.0 added its own check for this (staticfiles.W004).

[codecov]

Codecov Report

Merging #1455 (644f8f5) into main (3dc5437) will decrease coverage by 0.35%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1455      +/-   ##
==========================================
- Coverage   86.80%   86.44%   -0.36%     
==========================================
  Files          29       34       +5     
  Lines        1591     1844     +253     
  Branches      224      260      +36     
==========================================
+ Hits         1381     1594     +213     
- Misses        153      178      +25     
- Partials       57       72      +15     

Impacted Files	Coverage Δ
debug_toolbar/views.py	75.00% <0.00%> (ø)
debug_toolbar/settings.py	100.00% <0.00%> (ø)
debug_toolbar/__init__.py	100.00% <0.00%> (ø)
debug_toolbar/panels/__init__.py	95.38% <0.00%> (ø)
debug_toolbar/utils.py	76.15% <0.00%> (ø)
debug_toolbar/panels/profiling.py	89.28% <0.00%> (+2.67%)	⬆️

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[tim-schilling]

Ha! I was in the process of opening my PR to fix this and saw yours. Thank you.