workflow: use --force-with-lease instead of -f

.gitea/workflows/update-flake.yaml

@@ -16,7 +16,7 @@ jobs:
           fetch-depth: 0
           ref: flake-updates
 
-      - name: Fetch latest changes and reset branch
+      - name: Fetch latest changes and rebase
         run: |
           git fetch origin
           git rebase origin/main
@@ -37,5 +37,5 @@ jobs:
             echo "No changes to commit."
           else
             git commit -m "Update flake.lock $(date -I)"
-            git push -f origin flake-updates
+            git push --force-with-lease origin flake-updates
           fi