Bump MSTest.TestAdapter from 3.2.2 to 3.4.3

Bumps [MSTest.TestAdapter](https://github.com/microsoft/testfx) from 3.2.2 to 3.4.3.
- [Release notes](https://github.com/microsoft/testfx/releases)
- [Changelog](https://github.com/microsoft/testfx/blob/main/docs/Changelog.md)
- [Commits](microsoft/testfx@v3.2.2...v3.4.3)

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

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

StreamRegex.Tests/StreamRegex.Tests.csproj

@@ -10,7 +10,7 @@
     <ItemGroup>
         <PackageReference Include="MSTest.TestFramework" Version="3.2.2" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
-        <PackageReference Include="MSTest.TestAdapter" Version="3.2.2" />
+        <PackageReference Include="MSTest.TestAdapter" Version="3.4.3" />
     </ItemGroup>
 
     <ItemGroup>