add support for .net 9

Author: mvdgun

.github/workflows/Build.yaml

@@ -8,6 +8,7 @@ env:
     6.0.x
     7.0.x
     8.0.x
+    9.0.x
   DOTNET_BUILD_CONFIGURATION: Release
   SONAR_PATH: .\.sonar\scanner
   SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}

.github/workflows/Release.yaml

@@ -1,7 +1,7 @@
 name: FluentValidation.AutoValidation [Release]
 
 env:
-  DOTNET_VERSION: 8.0.x
+  DOTNET_VERSION: 9.0.x
   DOTNET_BUILD_CONFIGURATION: Release
   DOTNET_PACKAGES_OUTPUT_DIRECTORY: .nuget
   NUGET_SOURCE: https://api.nuget.org/v3/index.json