Bump MSTest.Sdk in the mstest group across 1 directory

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

Updates `MSTest.Sdk` from 3.6.3 to 3.7.0
- [Release notes](https://github.com/microsoft/testfx/releases)
- [Changelog](https://github.com/microsoft/testfx/blob/main/docs/Changelog.md)
- [Commits](microsoft/testfx@v3.6.3...v3.7.0)

---
updated-dependencies:
- dependency-name: MSTest.Sdk
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: mstest
...

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

UnitTests/UnitTests.csproj

@@ -13,11 +13,6 @@ SPDX-License-Identifier: MIT
     <CheckForOverflowUnderflow>true</CheckForOverflowUnderflow>
   </PropertyGroup>
 
-  <PropertyGroup>
-    <!-- Updates to transitive MSTest.Sdk dependencies -->
-    <MicrosoftNETTestSdkVersion>17.12.0</MicrosoftNETTestSdkVersion>
-  </PropertyGroup>
-
   <ItemGroup>
     <!-- Required for (Live) Unit Testing -->
     <Content Include="$(GitVersionOutputFile)" Link="gitversion.json" CopyToOutputDirectory="PreserveNewest" Visible="false" />

global.json

@@ -5,6 +5,6 @@
     "rollForward": "latestFeature"
   },
   "msbuild-sdks": {
-    "MSTest.Sdk": "3.6.3"
+    "MSTest.Sdk": "3.7.0"
   }
-}
+}