remove unnecessary git push

.gitea/workflows/update-flake.yaml

@@ -35,7 +35,6 @@ jobs:
             then
               git fetch origin
               git merge --squash origin/main || true # do not exit script on merge conflict
-              git push --force-with-lease
 
               # solve potential merge conflict by taking flake.lock from main
               git checkout origin/main -- flake.lock