Bump Microsoft.CodeAnalysis.CSharp in the microsoft group (#69)

Bumps the microsoft group with 1 update: [Microsoft.CodeAnalysis.CSharp](https://github.com/dotnet/roslyn).


Updates `Microsoft.CodeAnalysis.CSharp` from 4.12.0 to 4.13.0
- [Release notes](https://github.com/dotnet/roslyn/releases)
- [Changelog](https://github.com/dotnet/roslyn/blob/main/docs/Breaking%20API%20Changes.md)
- [Commits](https://github.com/dotnet/roslyn/commits)

---
updated-dependencies:
- dependency-name: Microsoft.CodeAnalysis.CSharp
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: microsoft
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Directory.Packages.props

@@ -1,7 +1,7 @@
 <Project>
   <ItemGroup>
     <PackageVersion Include="BenchmarkDotNet" Version="0.14.0" />
-    <PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="4.12.0" />
+    <PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="4.13.0" />
     <PackageVersion Include="MSTest" Version="3.8.2" />
   </ItemGroup>
 </Project>