Bump MSTest.TestAdapter from 3.6.2 to 3.7.3

Bumps [MSTest.TestAdapter](https://github.com/microsoft/testfx) from 3.6.2 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@v3.6.2...v3.7.3)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Directory.Packages.props

@@ -19,7 +19,7 @@
     <PackageVersion Include="Microsoft.Extensions.Logging.Abstractions" Version="6.0.0" />
     <PackageVersion Include="Microsoft.Extensions.Logging.Console" Version="8.0.0" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
-    <PackageVersion Include="MSTest.TestAdapter" Version="3.6.2" />
+    <PackageVersion Include="MSTest.TestAdapter" Version="3.7.3" />
     <PackageVersion Include="MSTest.TestFramework" Version="3.6.2" />
     <PackageVersion Include="Moq" Version="4.20.72" />
     <PackageVersion Include="Nerdbank.GitVersioning" Version="3.7.77-alpha" /> <!-- can use stable once 3.7 is released -->