Bump MSTest.TestAdapter from 3.3.1 to 3.4.0 (#42)

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

HolidayEventApi.Test/HolidayEventApi.Test.csproj

@@ -9,7 +9,7 @@
   <ItemGroup>
     <PackageReference Include="FluentAssertions" Version="6.12.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.10.0" />
-    <PackageReference Include="MSTest.TestAdapter" Version="3.3.1" />
+    <PackageReference Include="MSTest.TestAdapter" Version="3.4.0" />
     <PackageReference Include="MSTest.TestFramework" Version="3.3.1" />
     <PackageReference Include="coverlet.collector" Version="6.0.2" />
     <PackageReference Include="RichardSzalay.MockHttp" Version="7.0.0" />