Rename Django's dev branch to main.

[jezdez]

More information: https://groups.google.com/g/django-developers/c/tctDuKUGosc/
Refs: django/django#14048

[codecov]

Codecov Report

Merging #1456 (f868247) into main (5a3ccd9) will increase coverage by 0.16%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1456      +/-   ##
==========================================
+ Coverage   86.33%   86.50%   +0.16%     
==========================================
  Files          34       34              
  Lines        1852     1852              
  Branches      260      260              
==========================================
+ Hits         1599     1602       +3     
+ Misses        181      178       -3     
  Partials       72       72              

Impacted Files	Coverage Δ
debug_toolbar/panels/profiling.py	89.28% <0.00%> (+2.67%)	⬆️

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[tim-schilling]

Thanks @jezdez!