Remove unnecessary checkout and permissions from pr-auto-label

Author: maresb

.github/workflows/pr-auto-label.yml

@@ -5,14 +5,9 @@ on:
 jobs:
   sync:
     permissions:
-      contents: read
       pull-requests: write
     runs-on: ubuntu-latest
     steps:
-    - name: Checkout repository
-      uses: actions/checkout@v2
-      with:
-        persist-credentials: false
     - name: Sync labels with closing issues
       uses: wd60622/[email protected]
       with: