fix config name

Author: bowenli86

.github/workflows/remove-stale-branches.yml

@@ -20,6 +20,6 @@ jobs:
           days-before-branch-stale: 90
           days-before-branch-delete: 7
           operations-per-run: 100
-          exclude-branches-regex: "^(main|release-dev/.*|v[0-9]+\\.[0-9]+\\.[0-9]+)$"
+          exempt-branches-regex: "^(main|release-dev/.*|v[0-9]+\\.[0-9]+\\.[0-9]+)$"
           ignore-unknown-authors: true
           default-recipient: "bowenli86"