Update to ReSharper 2026.1

[bkoelman]

Full run at: https://github.com/json-api-dotnet/JsonApiDotNetCore/actions/runs/24430988458

Blockers for using extension blocks:

• CA1708 is incorrectly reported for extension members dotnet/sdk#51716
• [Feature Request] Support C# 14 extension blocks API metadata generation dotnet/docfx#11010

[codecov]

Codecov Report

❌ Patch coverage is 70.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.21%. Comparing base (1f6bb9c) to head (6c971df).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...sonApiDotNetCore/Diagnostics/CascadingCodeTimer.cs	0.00%	1 Missing ⚠️
.../JsonApiDotNetCore/Middleware/JsonApiMiddleware.cs	0.00%	1 Missing ⚠️
...piDotNetCore/Queries/Expressions/SortExpression.cs	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1930   +/-   ##
=======================================
  Coverage   92.21%   92.21%           
=======================================
  Files         437      437           
  Lines       14946    14946           
  Branches     2476     2476           
=======================================
  Hits        13782    13782           
  Misses        714      714           
  Partials      450      450           

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