Remove unnecessary reference to Microsoft.SourceLink.GitHub

[glen-84]

Summary of the changes (Less than 80 chars)

• Removed unnecessary reference to Microsoft.SourceLink.GitHub.
  • https://learn.microsoft.com/en-us/dotnet/core/compatibility/sdk/8.0/source-link

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (acffe7b) 73.15% compared to head (5eb54aa) 69.67%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6860      +/-   ##
==========================================
- Coverage   73.15%   69.67%   -3.48%     
==========================================
  Files        2499     2499              
  Lines      126162   126162              
==========================================
- Hits        92292    87903    -4389     
- Misses      33870    38259    +4389     

Flag	Coverage Δ
unittests	69.67% <ø> (-3.48%)	⬇️

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