USe unix path separator in artifact path

Author: russdaygh

.github/workflows/PocketDDDServerWebAPI2024.yml

@@ -6,7 +6,7 @@ on:
     - main
 
 env:
-  AZURE_WEBAPP_PACKAGE_PATH: PocketDDD.Server.WebAPI\publish
+  AZURE_WEBAPP_PACKAGE_PATH: PocketDDD.Server.WebAPI/publish
   CONFIGURATION: Release
   DOTNET_CORE_VERSION: 8.0.x
   WORKING_DIRECTORY: PocketDDD.Server/PocketDDD.Server.WebAPI