fix(docs): correct usage of steps (#4509)

It should be an array, not an object.

Author: ahamez

.github/workflows/labeler.yml

@@ -9,4 +9,4 @@ jobs:
       pull-requests: write
     runs-on: ubuntu-latest
     steps:
-      uses: actions/labeler@v4
+      - uses: actions/labeler@v4