Bump the mstest group with 2 updates

Bumps the mstest group with 2 updates: [MSTest.TestAdapter](https://github.com/microsoft/testfx) and [MSTest.TestFramework](https://github.com/microsoft/testfx).


Updates `MSTest.TestAdapter` from 3.7.2 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@v3.7.2...v3.7.3)

Updates `MSTest.TestFramework` from 3.7.2 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@v3.7.2...v3.7.3)

---
updated-dependencies:
- dependency-name: MSTest.TestAdapter
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: mstest
- dependency-name: MSTest.TestFramework
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: mstest
...

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

Author: dependabot[bot]

build/TestCommon.props

@@ -18,9 +18,9 @@
     <!-- Pinned: Be VERY careful about updating https://github.com/moq/moq/issues/1372 -->
     <PackageReference Include="Moq" Version="4.20.72" />
     <!-- Usage: MSTest execution -->
-    <PackageReference Include="MSTest.TestAdapter" Version="3.7.2" />
+    <PackageReference Include="MSTest.TestAdapter" Version="3.7.3" />
     <!-- Usage: MSTest asserts etc... -->
-    <PackageReference Include="MSTest.TestFramework" Version="3.7.2" />
+    <PackageReference Include="MSTest.TestFramework" Version="3.7.3" />
   </ItemGroup>
 
 </Project>