Merge master into openapi

[bkoelman]

Merges the master branch into openapi, which drops support for .NET 6 and runs tests against .NET 9.

[codecov]

Codecov Report

Attention: Patch coverage is 99.45235% with 5 lines in your changes missing coverage. Please review.

Project coverage is 90.38%. Comparing base (db1be78) to head (df14313).
Report is 12 commits behind head on openapi.

Files with missing lines	Patch %	Lines
src/Examples/DapperExample/Program.cs	33.33%	2 Missing ⚠️
...c/JsonApiDotNetCore/Configuration/ResourceGraph.cs	66.66%	2 Missing ⚠️
...piDotNetCore/Diagnostics/AspNetCodeTimerSession.cs	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           openapi    #1657      +/-   ##
===========================================
- Coverage    90.38%   90.38%   -0.01%     
===========================================
  Files          462      460       -2     
  Lines        14027    13985      -42     
  Branches      2183     2177       -6     
===========================================
- Hits         12679    12641      -38     
+ Misses         915      911       -4     
  Partials       433      433              

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