Update NuGet packages

[martincostello]

Update various NuGet dependencies to their latest versions.

[Copilot]

Pull Request Overview

Updates various NuGet package dependencies to their latest versions across the project.

• Updates Duende.IdentityServer from 7.3.1 to 7.3.2 for both .NET 8.0 and 9.0 targets
• Updates multiple development and testing packages including BenchmarkDotNet, Newtonsoft.Json, NSwag.MSBuild, ReportGenerator, and Verify.XunitV3
• Maintains consistent versioning across different target frameworks

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
test/WebSites/OAuth2Integration/OAuth2Integration.csproj	Updates Duende.IdentityServer to version 7.3.2 for both .NET 8.0 and 9.0 frameworks
Directory.Packages.props	Updates multiple NuGet package versions including testing, benchmarking, and utility packages

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.28%. Comparing base (a0dbf30) to head (1723e46).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3573   +/-   ##
=======================================
  Coverage   94.28%   94.28%           
=======================================
  Files         110      110           
  Lines        3816     3816           
  Branches      723      723           
=======================================
  Hits         3598     3598           
  Misses        218      218           

Flag	Coverage Δ
Linux	94.28% <ø> (ø)
Windows	94.28% <ø> (ø)
macOS	94.28% <ø> (ø)

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