Update sponsors

[martincostello]

• Add Microsoft as a sponsor.
• Disable the images from linking to themselves.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.82%. Comparing base (d009125) to head (f5c5215).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2169      +/-   ##
==========================================
+ Coverage   83.80%   83.82%   +0.02%     
==========================================
  Files         313      313              
  Lines        7161     7161              
  Branches     1060     1060              
==========================================
+ Hits         6001     6003       +2     
+ Misses        789      788       -1     
+ Partials      371      370       -1     

Flag	Coverage Δ
linux	83.82% <ø> (+0.02%)	⬆️
macos	83.80% <ø> (ø)
windows	?

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