fix pr-labels workflow (#8272)

Author: pmeier

.github/workflows/pr-labels.yml

@@ -8,28 +8,33 @@ on:
 jobs:
   is-properly-labeled:
     runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
 
     steps:
       - name: Set up python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v5
 
       - name: Install requests
         run: pip install requests
 
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Process commit and find merger responsible for labeling
         id: commit
-        run: echo "merger=$(python .github/process_commit.py ${{ github.sha }})" >> $GITHUB_OUTPUT
+        run: |
+          MERGER=$(python .github/process_commit.py ${{ github.sha }})
+          echo "merger=${MERGER}" | tee --append $GITHUB_OUTPUT
 
       - name: Ping merger responsible for labeling if necessary
         if: ${{ steps.commit.outputs.merger != '' }}
-        uses: mshick/add-pr-comment@v1
+        uses: mshick/add-pr-comment@v2
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         with:
           message: |
             Hey ${{ steps.commit.outputs.merger }}!
 
-            You merged this PR, but no labels were added. The list of valid labels is available at https://github.com/pytorch/vision/blob/main/.github/process_commit.py
+            You merged this PR, but no labels were added.
+            The list of valid labels is available at https://github.com/pytorch/vision/blob/main/.github/process_commit.py