update dependabot

.github/workflows/dependabot.yml

@@ -12,8 +12,9 @@ jobs:
     name: run PlatformIO Dependabot
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: run PlatformIO Dependabot
         uses: peterus/platformio_dependabot@v1
         with:
-          github_token: ${{ secrets.DEPENDABOT_PAT }}
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          assignee: peterus