chore: ci auto-merge fix

Author: dalisoft

.github/workflows/automerge.yml

@@ -1,17 +1,18 @@
 name: Auto-merge dependabot updates
 
-on: pull_request
+on: pull_request_target
 
 jobs:
   auto-merge:
     timeout-minutes: 5
 
     runs-on: ubuntu-18.04
+    if: github.actor == 'dependabot[bot]'
 
     steps:
       - uses: actions/checkout@v2
       - uses: ahmadnassri/action-dependabot-auto-merge@v2
         with:
           target: minor
           approve: true
-          github-token: ${{ secrets.GITHUB_TOKEN }}
+          github-token: ${{ secrets.GH_TOKEN }}