build(deps): bump the test-deps group in /OSLC4Net_SDK with 2 updates

Bumps the test-deps group in /OSLC4Net_SDK with 2 updates: [MSTest.TestFramework](https://github.com/microsoft/testfx) and [MSTest.TestAdapter](https://github.com/microsoft/testfx).


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)

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)

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

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

OSLC4Net_SDK/Directory.Packages.props

@@ -5,7 +5,7 @@
   </PropertyGroup>
   <PropertyGroup>
     <!-- Versions used by several individual references below -->
-    <MSTestVersion>3.7.2</MSTestVersion>
+    <MSTestVersion>3.7.3</MSTestVersion>
   </PropertyGroup>
   <ItemGroup>
     <!-- For removal -->