Checkout repo in label action (#327)

Author: klane

.github/workflows/labeler.yml

@@ -9,6 +9,9 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
       - name: Generate token
         id: generate-token
         uses: tibdex/github-app-token@v2