fix workflow permissions

Author: heap-coder

.github/workflows/update-solc.yml

@@ -5,6 +5,10 @@ on:
     - cron: '0 0 * * *'
   workflow_dispatch: {}
 
+permissions:
+  contents: write
+  pull-requests: write
+
 jobs:
   update:
     runs-on: ubuntu-latest
@@ -28,7 +32,6 @@ jobs:
     - name: Create Pull Request
       uses: peter-evans/create-pull-request@v7
       with:
-        token: ${{ secrets.PR_PAT }}
         branch: update-solc
         title: Update solc
         body: |