Bump MSTest.Sdk from 3.7.2 to 3.7.3 in the mstest group

Bumps the mstest group with 1 update: [MSTest.Sdk](https://github.com/microsoft/testfx).


Updates `MSTest.Sdk` 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.Sdk
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: mstest
...

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

global.json

@@ -6,6 +6,6 @@
   },
   "msbuild-sdks": {
     "Microsoft.Build.NoTargets": "3.7.56",
-    "MSTest.Sdk": "3.7.2"
+    "MSTest.Sdk": "3.7.3"
   }
 }