chore: Bump Microsoft.CodeAnalysis.CSharp from 4.14.0 to 5.9.0

---
updated-dependencies:
- dependency-name: Microsoft.CodeAnalysis.CSharp
  dependency-version: 5.9.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

ManagedCode.Communication.Benchmark/ManagedCode.Communication.Benchmark.csproj

@@ -11,6 +11,7 @@
 
     <ItemGroup>
         <PackageReference Include="BenchmarkDotNet" />
+        <PackageReference Include="Microsoft.CodeAnalysis.CSharp" />
     </ItemGroup>
 
     <ItemGroup>