👷 Update GitHub Action labeler to add only one label (#1304)

.github/workflows/labeler.yml

@@ -1,4 +1,4 @@
-name: Pull Request Labeler and Checker
+name: Labels
 on:
   pull_request_target:
     types:
@@ -17,13 +17,14 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/labeler@v5
+      with:
+        sync-labels: true
   # Run this after labeler applied labels
   check-labels:
     needs:
       - labeler
     permissions:
       pull-requests: read
-    name: Check labels
     runs-on: ubuntu-latest
     steps:
       - uses: docker://agilepathway/pull-request-label-checker:latest