Remove net7.0 support

[Enterprize1]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 70.08547% with 35 lines in your changes missing coverage. Please review.

Project coverage is 72.80%. Comparing base (69146a7) to head (9564b9d).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/Fluss/UnitOfWork/UnitOfWorkRecordingProxy.cs	0.00%	13 Missing ⚠️
src/Fluss.Testing/PolicyTestBed.cs	0.00%	9 Missing ⚠️
src/Fluss.Testing/AggregateTestBed.cs	0.00%	5 Missing ⚠️
src/Fluss.Testing/EventTestBed.cs	0.00%	3 Missing ⚠️
src/Fluss.Testing/ReadModelTestBed.cs	0.00%	3 Missing ⚠️
src/Fluss/Events/EventListener.cs	50.00%	1 Missing ⚠️
src/Fluss/UnitOfWork/UnitOfWork.Aggregates.cs	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #6      +/-   ##
==========================================
- Coverage   73.16%   72.80%   -0.36%     
==========================================
  Files          52       51       -1     
  Lines        1971     1894      -77     
  Branches      195      189       -6     
==========================================
- Hits         1442     1379      -63     
+ Misses        482      469      -13     
+ Partials       47       46       -1     

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