Bump Microsoft.NET.Test.Sdk from 17.7.2 to 17.8.0

Bumps [Microsoft.NET.Test.Sdk](https://github.com/microsoft/vstest) from 17.7.2 to 17.8.0.
- [Release notes](https://github.com/microsoft/vstest/releases)
- [Changelog](https://github.com/microsoft/vstest/blob/main/docs/releases.md)
- [Commits](microsoft/vstest@v17.7.2...v17.8.0)

---
updated-dependencies:
- dependency-name: Microsoft.NET.Test.Sdk
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

src/Directory.Build.props

@@ -20,7 +20,7 @@
   <PropertyGroup>
     <XunitVersion>2.5.3</XunitVersion>
     <XunitRunnerVersion>2.5.3</XunitRunnerVersion>
-    <TestSdkVersion>17.7.2</TestSdkVersion>
+    <TestSdkVersion>17.8.0</TestSdkVersion>
     <HyperionVersion>0.12.2</HyperionVersion>
     <NewtonsoftJsonVersion>[13.0.1,)</NewtonsoftJsonVersion>
     <NBenchVersion>2.0.1</NBenchVersion>