Bump MSTest.TestFramework from 3.6.2 to 3.6.4

Bumps [MSTest.TestFramework](https://github.com/microsoft/testfx) from 3.6.2 to 3.6.4.
- [Release notes](https://github.com/microsoft/testfx/releases)
- [Changelog](https://github.com/microsoft/testfx/blob/main/docs/Changelog.md)
- [Commits](microsoft/testfx@v3.6.2...v3.6.4)

---
updated-dependencies:
- dependency-name: MSTest.TestFramework
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Directory.Packages.props

@@ -70,7 +70,7 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
     </PackageVersion>
     <PackageVersion Include="MSTest.TestAdapter" Version="3.5.2" />
-    <PackageVersion Include="MSTest.TestFramework" Version="3.6.2" />
+    <PackageVersion Include="MSTest.TestFramework" Version="3.6.4" />
     <PackageVersion Include="coverlet.collector" Version="6.0.2" />
   </ItemGroup>
 </Project>