Merge branch 'Issue/1910-MigrationtoNET6.0' into 'dev'

Update: Migrated to .NET6.0 (coscine/issues#1910)

See merge request !6

src/CodeGen/CodeGen.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net5.0</TargetFramework>
+    <TargetFramework>net6.0</TargetFramework>
     <AssemblyName>Coscine.CodeGen</AssemblyName>
     <RootNamespace>Coscine.CodeGen</RootNamespace>
   </PropertyGroup>