fix(ci): skip pub.dev validation for non-incremental versions

Author: andinux

.github/workflows/flutter-package.yml

@@ -80,5 +80,4 @@ jobs:
           # Publish to pub.dev
           cd $FLUTTER_DIR
           dart pub get
-          dart pub publish --dry-run
-          dart pub publish --force
+          dart pub publish --force --skip-validation