Update dotnet monorepo to v5

Author: renovate[bot]

src/Directory.Packages.props

@@ -23,8 +23,8 @@
       is compiled against.
     -->
     <PackageVersion Include="Microsoft.CodeAnalysis.Analyzers" Version="3.11.0" />
-    <PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="4.14.0" />
-    <PackageVersion Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.14.0" />
+    <PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="5.0.0" />
+    <PackageVersion Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="5.0.0" />
 
     <!-- Test Infrastructure -->
     <PackageVersion Include="Basic.Reference.Assemblies.Net100" Version="1.8.4" />