Change dotnet version to 8 for backend CI

.github/workflows/backend-ci.yml

@@ -12,7 +12,7 @@ jobs:
       - name: Setup .NET
         uses: actions/setup-dotnet@v1
         with:
-          dotnet-version: '7.0.x'
+          dotnet-version: '8.0.x'
       - name: Restore dependencies
         run: |
           cd backend
@@ -31,4 +31,4 @@ jobs:
           app-name: "<YOUR_APP_SERVICE_NAME>"
           slot-name: "production" # if using deployment slots
           publish-profile: ${{ secrets.AZURE_WEBAPP_PUBLISH_PROFILE }}
-          package: ./backend/publish
+          package: ./backend/publish