Bump MSTest.TestAdapter from 2.2.3 to 2.2.4 (#536)

Bumps [MSTest.TestAdapter](https://github.com/microsoft/testfx) from 2.2.3 to 2.2.4.
- [Release notes](https://github.com/microsoft/testfx/releases)
- [Commits](microsoft/testfx@v2.2.3...v2.2.4)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

src/ApprovalTests.MSTest/ApprovalTests.MSTest.csproj

@@ -8,7 +8,7 @@
     <PackageReference Include="ModuleInit.Fody" Version="2.1.1" PrivateAssets="All" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.10.0" />
     <PackageReference Include="MSTest.TestFramework" Version="2.2.3" />
-    <PackageReference Include="MSTest.TestAdapter" Version="2.2.3" />
+    <PackageReference Include="MSTest.TestAdapter" Version="2.2.4" />
     <ProjectReference Include="..\ApprovalUtilities\ApprovalUtilities.csproj" />
     <ProjectReference Include="..\ApprovalTests\ApprovalTests.csproj" />
     <Service Include="{82a7f48d-3b50-4b1e-b82e-3ada8210c358}" />