fix: use GitHub App token instead of PAT

.github/workflows/stopper.yml

@@ -23,10 +23,19 @@ jobs:
   stop-workflows:
     runs-on: ubuntu-latest
     steps:
+      - name: Generate App Token
+        uses: actions/create-github-app-token@v1
+        id: app-token
+        with:
+          app-id: ${{ secrets.WORKFLOW_STOPPER_APP_ID }}
+          private-key: ${{ secrets.WORKFLOW_STOPPER_APP_KEY }}
+          owner: pezkuwichain
+          repositories: pezkuwi-sdk
+
       - name: Cancel running workflows
         uses: actions/github-script@v7
         with:
-          github-token: ${{ secrets.WORKFLOW_STOPPER_TOKEN }}
+          github-token: ${{ steps.app-token.outputs.token }}
           script: |
             const [owner, repo] = '${{ github.event.inputs.github_repository }}'.split('/');
             const sha = '${{ github.event.inputs.github_sha }}';