Allow flutter branch lint to skip pub get in setup, since analyze pulls anyway

Author: acpoppe

.github/workflows/flutter-branch.yml

@@ -61,6 +61,7 @@ jobs:
           use-cache: false
           clean: true
           working-directory: ${{ inputs.working-directory }}
+          skip-pub-get: true
           skip-build-runner: true
       - run: flutter analyze