fix gh actions

Author: techno-disaster

.github/workflows/create_artifacts.yml

@@ -22,6 +22,7 @@ jobs:
     - name: Flutter format
       run: |
         flutter format . --set-exit-if-changed
+        flutter pub get
         flutter pub run import_sorter:main --no-comments --exit-if-changed
     - name: Flutter analyze 
       run: flutter analyze .