Change upstream url

Author: p1gp1g

.github/workflows/sync.yml

@@ -20,7 +20,7 @@ jobs:
 
       - name: Fetch and merge upstream
         run: |
-          git remote add upstream https://github.com/signalapp/Signal-Android.git
+          git remote add upstream https://github.com/mollyim/mollyim-android.git
           git fetch upstream
           git merge --ff-only upstream/main