Use the Microsoft.CodeAnalysis.CSharp package from .NET 8 (#881)

Author: mauroservienti

src/ServiceComposer.AspNetCore.SourceGeneration/ServiceComposer.AspNetCore.SourceGeneration.csproj

@@ -21,7 +21,7 @@
             <PrivateAssets>all</PrivateAssets>
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
         </PackageReference>
-        <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.12.0" PrivateAssets="all" />
+        <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.11.0" PrivateAssets="all" />
     </ItemGroup>
 
     <ItemGroup>