Bump the dotnet group with 2 updates

Bumps MSTest.TestAdapter from 3.9.2 to 3.9.3
Bumps MSTest.TestFramework from 3.9.2 to 3.9.3

---
updated-dependencies:
- dependency-name: MSTest.TestAdapter
  dependency-version: 3.9.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dotnet
- dependency-name: MSTest.TestFramework
  dependency-version: 3.9.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dotnet
...

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

Author: dependabot[bot]

docs/core/tutorials/snippets/library-with-visual-studio/vb/StringLibraryTest/StringLibraryTest.vbproj

@@ -8,8 +8,8 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
-    <PackageReference Include="MSTest.TestAdapter" Version="3.9.2" />
-    <PackageReference Include="MSTest.TestFramework" Version="3.9.2" />
+    <PackageReference Include="MSTest.TestAdapter" Version="3.9.3" />
+    <PackageReference Include="MSTest.TestFramework" Version="3.9.3" />
     <PackageReference Include="coverlet.collector" Version="6.0.4" />
   </ItemGroup>