fix update-version.sh not pushing HEAD to branch

.github/scripts/update-version.sh

@@ -3,7 +3,7 @@ if [ ! -z $(git diff --name-only HEAD HEAD~1 | grep build.gradle) ]; then
   sed --in-place "s!//version:.*!//version: $new_version!g" build.gradle
   git add build.gradle
   git commit -m "[ci skip] update build script version to $new_version"
-  git push origin ${GITHUB_REF##*/}
+  git push origin HEAD:${GITHUB_REF##*/}
   echo "Updated buildscript version to $new_version"; 
 else
   echo "Ignored buildscript version update: no changes detected"