Bump MSTestVersion from 3.7.1 to 3.7.2 (#18)

Bumps `MSTestVersion` from 3.7.1 to 3.7.2.

Updates `MSTest.TestFramework` from 3.7.1 to 3.7.2
- [Release notes](https://github.com/microsoft/testfx/releases)
- [Changelog](https://github.com/microsoft/testfx/blob/main/docs/Changelog.md)
- [Commits](microsoft/testfx@v3.7.1...v3.7.2)

Updates `MSTest.TestAdapter` from 3.7.1 to 3.7.2
- [Release notes](https://github.com/microsoft/testfx/releases)
- [Changelog](https://github.com/microsoft/testfx/blob/main/docs/Changelog.md)
- [Commits](microsoft/testfx@v3.7.1...v3.7.2)

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

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

Author: dependabot[bot]

Directory.Packages.props

@@ -1,6 +1,6 @@
 <Project>
   <PropertyGroup Label="Test dependencies">
-    <MSTestVersion>3.7.1</MSTestVersion>
+    <MSTestVersion>3.7.2</MSTestVersion>
     <MicrosoftNETTestSdkVersion>17.12.0</MicrosoftNETTestSdkVersion>
   </PropertyGroup>
 </Project>