chore(deps): bump MSTest.TestAdapter from 2.1.2 to 3.3.1

Bumps [MSTest.TestAdapter](https://github.com/microsoft/testfx) from 2.1.2 to 3.3.1.
- [Release notes](https://github.com/microsoft/testfx/releases)
- [Changelog](https://github.com/microsoft/testfx/blob/main/docs/Changelog.md)
- [Commits](microsoft/testfx@v2.1.2...v3.3.1)

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

Signed-off-by: dependabot[bot] <support@github.com>

src/NvGet.Tests/NvGet.Tests.csproj

@@ -7,7 +7,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.8.0" />
-    <PackageReference Include="MSTest.TestAdapter" Version="2.1.2" />
+    <PackageReference Include="MSTest.TestAdapter" Version="3.3.1" />
     <PackageReference Include="MSTest.TestFramework" Version="2.1.2" />
 		<PackageReference Include="Mono.Options" Version="6.6.0.161" />
   </ItemGroup>