Bump MSTest from 3.6.2 to 3.6.3 in /src

Bumps [MSTest](https://github.com/microsoft/testfx) from 3.6.2 to 3.6.3.
- [Release notes](https://github.com/microsoft/testfx/releases)
- [Changelog](https://github.com/microsoft/testfx/blob/main/docs/Changelog.md)
- [Commits](https://github.com/microsoft/testfx/commits)

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

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

src/Testing.Autofac.Tests/Testing.Autofac.Tests.csproj

@@ -6,7 +6,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="MSTest" Version="3.6.2" />
+    <PackageReference Include="MSTest" Version="3.6.3" />
   </ItemGroup>
 
   <ItemGroup>