Update to .NET 11

[Saancreed]

Unfortunately, the Npgsql shenanigans which require us to pull packages from daily .NET package feed make me very reluctant to merge this before upstream resolves this in a reasonable manner. See the "Update integration tests to .NET 11 and Npgsql.EFCore to rc.1" and "Update Extensions version to satisfy EFCore requirements" for details.

[github-actions]

Summary

Tests 📝	Passed ✅	Failed ❌	Skipped ⏭️	Other ❓	Flaky 🍂	Duration ⏱️
950	946	0	4	0	0	2m 27s

Skipped

Tests	Status
LeanCode.IntegrationTests.TimestampTzTests.Sorting_by_LocalTimestampWithoutOffset_returns_results_in_expected_order	skipped ⏭️
LeanCode.IntegrationTests.TimestampTzTests.Sorting_by_UtcTimestamp_returns_results_in_expected_order	skipped ⏭️
LeanCode.IntegrationTests.TimestampTzTests.Sorting_by_LocalTimestampWithoutOffset_generates_SQL_with_expected_AT_TIME_ZONE_operator	skipped ⏭️
LeanCode.Azure.Tests.AzureStorageAuditLogIntegrationTests.Ensure_that_all_logs_are_correctly_uploaded_to_multiple_files	skipped ⏭️

_{🎉 No failed tests in this run.}

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[codecov]

Codecov Report

❌ Patch coverage is 61.90476% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.34%. Comparing base (aa8a1e2) to head (f89807d).

Files with missing lines	Patch %	Lines
...eanCode.AzureIdentity/DefaultLeanCodeCredential.cs	0.00%	4 Missing ⚠️
.../Incoming/ServiceToServiceAuthenticationHandler.cs	0.00%	2 Missing and 1 partial ⚠️
...ructure/LeanCode.Firebase/FirebaseConfiguration.cs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                @@
##           v11.0-preview     #896      +/-   ##
=================================================
- Coverage          85.41%   85.34%   -0.07%     
=================================================
  Files                246      246              
  Lines               5210     5227      +17     
  Branches             385      385              
=================================================
+ Hits                4450     4461      +11     
- Misses               676      681       +5     
- Partials              84       85       +1     

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