Update dependency Microsoft.CodeAnalysis.CSharp to v5

Author: renovate[bot]

src/CodeGeneration/CodeGeneration.csproj

@@ -40,7 +40,7 @@
 
   <!-- Dependencies -->
   <ItemGroup>
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.14.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="5.0.0" />
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0" PrivateAssets="All" />
   </ItemGroup>