Bump MSTest.TestAdapter from 3.2.2 to 3.7.3

Bumps [MSTest.TestAdapter](https://github.com/microsoft/testfx) from 3.2.2 to 3.7.3.
- [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...v3.7.3)

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

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

Author: dependabot[bot]

test/UnitTests/UnitTests.csproj

@@ -18,7 +18,7 @@
         </PackageReference>
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
         <PackageReference Include="Moq" Version="4.20.70" />
-        <PackageReference Include="MSTest.TestAdapter" Version="3.2.2" />
+        <PackageReference Include="MSTest.TestAdapter" Version="3.7.3" />
         <PackageReference Include="MSTest.TestFramework" Version="3.2.2" />
         <PackageReference Include="xunit" Version="2.7.0" />
         <PackageReference Include="xunit.analyzers" Version="1.11.0" />