fix(github): env dotnet_version

Author: nadirbad

.github/workflows/actions.yml

@@ -15,7 +15,7 @@ on:
 # Create an environment variable named DOTNET_VERSION
 # and set it as "7.0.x"
 env:
-  DOTNET_VERSION: "7.0.x" # The .NET SDK version to use
+  DOTNET_VERSION: "8.0.x" # The .NET SDK version to use
 
 # Defines a single job named "build-and-test"
 jobs: