chore(deps): update mstest monorepo to 4.2.1

Author: renovate[bot]

Directory.Packages.props

@@ -5,7 +5,7 @@
   <ItemGroup>
     <PackageVersion Include="coverlet.collector" Version="8.0.1" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.4.0" />
-    <PackageVersion Include="MSTest.TestAdapter" Version="4.1.0" />
-    <PackageVersion Include="MSTest.TestFramework" Version="4.1.0" />
+    <PackageVersion Include="MSTest.TestAdapter" Version="4.2.1" />
+    <PackageVersion Include="MSTest.TestFramework" Version="4.2.1" />
   </ItemGroup>
 </Project>