chore: add dependabot auto-merge (#12)

<!-- GITHUB_RELEASE PR BODY: canary-version -->
<details>
<summary>📦 Published PR as canary version:
<code>0.0.20--canary.12.7a6b862.0</code></summary>
  <br />

  ✨ Test out this PR locally via:
  
  ```bash
npm install
[email protected]
  # or 
yarn add [email protected]
  ```
</details>
<!-- GITHUB_RELEASE PR BODY: canary-version -->

.github/workflows/dependabot-auto-merge.yml

@@ -0,0 +1,24 @@
+name: Dependabot auto-merge
+on: pull_request
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  dependabot:
+    runs-on: ubuntu-latest
+    if: github.actor == 'dependabot[bot]'
+    steps:
+      - name: Dependabot metadata
+        id: metadata
+        uses: dependabot/fetch-metadata@v2
+        with:
+          github-token: "${{ secrets.GITHUB_TOKEN }}"
+      - name: Enable auto-merge for Dependabot PRs
+        if: steps.metadata.outputs.update-type == 'version-update:semver-minor' && steps.metadata.outputs.update-type == 'version-update:semver-patch'
+        # contains(steps.metadata.outputs.dependency-names, 'my-dependency')
+        run: gh pr merge --auto --merge "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GH_TOKEN: ${{secrets.GITHUB_TOKEN}}