Stop auto-merge dependabot PRs

Our CI runs a fair amount of unaudited third party code. I'd like to
stop using my Personal Access Token until we have had time to security
harden our CI.

.github/workflows/Auto-merge-dependabot-PRs.yml

@@ -1,23 +0,0 @@
-# This workflow triggers auto-merge of any PR that dependabot creates so that
-# PRs will be merged automatically without maintainer intervention if CI passes
-name: Auto-merge dependabot PRs
-
-on:
-  pull_request_target:
-    types: [opened]
-
-jobs:
-  auto-merge:
-    if: github.repository == 'sharkdp/bat' && startsWith(github.head_ref, 'dependabot/')
-    runs-on: ubuntu-latest
-    environment:
-      name: auto-merge
-      url: https://github.com/sharkdp/bat/blob/main/.github/workflows/Auto-merge-dependabot-PRs.yml
-    env:
-      GITHUB_TOKEN: ${{ secrets.AUTO_MERGE_GITHUB_TOKEN }}
-    steps:
-      - uses: actions/checkout@v4
-      - run: |
-          gh pr review ${{ github.event.pull_request.number }} --comment --body "If CI passes, this dependabot PR will be [auto-merged](https://github.com/sharkdp/bat/blob/main/.github/workflows/Auto-merge-dependabot-PRs.yml) 🚀"
-      - run: |
-          gh pr merge --auto --squash ${{ github.event.pull_request.number }}