Bump MSTest.TestAdapter from 3.3.1 to 3.4.0

Bumps [MSTest.TestAdapter](https://github.com/microsoft/testfx) from 3.3.1 to 3.4.0.
- [Release notes](https://github.com/microsoft/testfx/releases)
- [Changelog](https://github.com/microsoft/testfx/blob/main/docs/Changelog.md)
- [Commits](microsoft/testfx@v3.3.1...v3.4.0)

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

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

Directory.Packages.props

@@ -11,7 +11,7 @@
  <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.10.0" />
  <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="8.0.0" />
  <PackageVersion Include="Moq" Version="4.20.70" />
- <PackageVersion Include="MSTest.TestAdapter" Version="3.3.1" />
+ <PackageVersion Include="MSTest.TestAdapter" Version="3.4.0" />
  <PackageVersion Include="MSTest.TestFramework" Version="3.3.1" />
  <PackageVersion Include="NonBlocking" Version="2.1.2" />
  <PackageVersion Include="NUnit" Version="4.1.0" />