[CI] Fix branch name in rebaseline-tests.yml

Author: sbc100

.github/workflows/rebaseline-tests.yml

@@ -51,6 +51,6 @@ jobs:
                exit 1
             fi
           fi
-          git push origin testing
+          git push origin rebaseline_tests
           gh pr create --fill --base ${{ github.ref_name }}
           gh pr merge --squash --auto