chore(deps): update dependency microsoft.net.test.sdk to 18.8.0

[thomhurst]

This PR contains the following updates:

Package	Type	Update	Change
Microsoft.NET.Test.Sdk	nuget	minor	18.7.0 → 18.8.0

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Release Notes

microsoft/vstest (Microsoft.NET.Test.Sdk)

v18.8.0

What's Changed

• Migrate from Newtonsoft.Json to System.Text.Json / Jsonite (merge to main) by @​nohwnd in #​15687
  • For more detail refer to https://devblogs.microsoft.com/dotnet/vs-test-is-removing-its-newtonsoft-json-dependency/
• Create source-only filter package by @​Youssef1313 in #​15638
  • Package release is pending.
• Add ARM64 msdia140.dll support to test platform packages by @​nohwnd in #​15692
• Fix mutex cleanup crash on macOS/Linux by @​nohwnd in #​15684
• Restrict artifact temp directory permissions on Unix by @​nohwnd in #​15729
• Add support for filtering uncategorized tests with TestCategory=None by @​Evangelink in #​15727
• Fix SCI binding failure in DTA hosts (main) by @​nohwnd in #​15724
• Fix HTML logger parallel file collision by @​nohwnd in #​15435
• Improve error message when testhost cannot be found by @​nohwnd in #​16053
• Fix HTML logger exception on invalid XML chars in test display names by @​nohwnd in #​16051

Full Changelog: microsoft/vstest@v18.7.0...v18.8.0

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This PR has been generated by Mend Renovate.

[codacy-production]

Up to standards ✅

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[claude]

Code review

No issues found. This is an automated Renovate dependency bump (Microsoft.NET.Test.Sdk 18.7.0 → 18.8.0) touching a single line in Directory.Packages.props. No source, build logic, or public API changes are involved, so there's nothing to flag for correctness or CLAUDE.md compliance. Looks good to merge assuming CI passes.