chore(deps): update mstest to 4.2.1

[thomhurst]

This PR contains the following updates:

Package	Type	Update	Change
MSTest	nuget	minor	4.1.0 → 4.2.1
MSTest.TestAdapter	nuget	minor	4.1.0 → 4.2.1
MSTest.TestFramework	nuget	minor	4.1.0 → 4.2.1

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This PR has been generated by Renovate Bot.

[claude]

Code Review: MSTest Dependency Update (4.1.0 → 4.2.1)

This is a straightforward Renovate bot dependency update bumping all three MSTest packages in lock-step:

• MSTest 4.1.0 → 4.2.1
• MSTest.TestAdapter 4.1.0 → 4.2.1
• MSTest.TestFramework 4.1.0 → 4.2.1

Assessment: ✅ LGTM

All three packages are bumped together to the same version, which is correct — these packages are tightly coupled and should always be kept in sync. The change is isolated to Directory.Packages.props using Central Package Management, which is the right approach.

Nothing architectural to flag here. The update is clean, consistent, and follows the existing pattern in the repo.

[codacy-production]

Up to standards ✅

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