Bump MSTest.TestAdapter from 2.2.8 to 2.2.9

Bumps [MSTest.TestAdapter](https://github.com/microsoft/testfx) from 2.2.8 to 2.2.9.
- [Release notes](https://github.com/microsoft/testfx/releases)
- [Commits](microsoft/testfx@v2.2.8...v2.2.9)

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

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

Author: dependabot[bot]

DIDemo.Services.Tests/DIDemo.Services.Tests.csproj

@@ -5,7 +5,7 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.0.0" />
-    <PackageReference Include="MSTest.TestAdapter" Version="2.2.8" />
+    <PackageReference Include="MSTest.TestAdapter" Version="2.2.9" />
     <PackageReference Include="MSTest.TestFramework" Version="2.2.8" />
   </ItemGroup>
   <ItemGroup>

DIDemo.Tests/DIDemo.Tests.csproj

@@ -5,7 +5,7 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.0.0" />
-    <PackageReference Include="MSTest.TestAdapter" Version="2.2.8" />
+    <PackageReference Include="MSTest.TestAdapter" Version="2.2.9" />
     <PackageReference Include="MSTest.TestFramework" Version="2.2.8" />
   </ItemGroup>
   <ItemGroup>