fix: fixed wrong command for windows

Author: nofyso

.github/workflows/build.yml

@@ -137,7 +137,7 @@ jobs:
       - name: Remove lock
         working-directory: example
         run: |
-          rm -f pubspec.lock
+          Remove-Item -Path "pubspec.lock" -ErrorAction Ignore
 
       - name: Set up Flutter
         uses: subosito/flutter-action@v2