CI give correct permissions for the clang-format action

closes https://github.com/official-stockfish/Stockfish/pull/5470

No functional change

.github/workflows/clang-format.yml

@@ -11,6 +11,10 @@ on:
     paths:
       - "**.cpp"
       - "**.h"
+
+permissions:
+  pull-requests: write
+
 jobs:
   Clang-Format:
     name: Clang-Format
@@ -39,6 +43,7 @@ jobs:
 
             _(execution **${{ github.run_id }}** / attempt **${{ github.run_attempt }}**)_
           comment_tag: execution
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Comment on PR
         if: steps.clang-format.outcome != 'failure'
@@ -49,3 +54,4 @@ jobs:
           create_if_not_exists: false
           comment_tag: execution
           mode: delete
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}