Bump MSTest.TestAdapter from 3.0.2 to 3.1.1

Bumps [MSTest.TestAdapter](https://github.com/microsoft/testfx) from 3.0.2 to 3.1.1.
- [Release notes](https://github.com/microsoft/testfx/releases)
- [Changelog](https://github.com/microsoft/testfx/blob/main/docs/Changelog.md)
- [Commits](microsoft/testfx@v3.0.2...v3.1.1)

---
updated-dependencies:
- dependency-name: MSTest.TestAdapter
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Directory.Packages.props

@@ -61,7 +61,7 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
     </PackageVersion>
-    <PackageVersion Include="MSTest.TestAdapter" Version="3.0.2" />
+    <PackageVersion Include="MSTest.TestAdapter" Version="3.1.1" />
     <PackageVersion Include="MSTest.TestFramework" Version="3.0.2" />
     <PackageVersion Include="coverlet.collector" Version="6.0.0" />
   </ItemGroup>