dependabot: add yt-dlp in qa

Also sets up an auto-approve for dependabot PRs.

.github/workflows/dependabot.yml

@@ -0,0 +1,21 @@
+name: Dependabot
+on: pull_request
+
+permissions:
+  pull-requests: write
+
+jobs:
+  dependabot:
+    runs-on: ubuntu-latest
+    if: github.event.pull_request.user.login == 'dependabot[bot]' && github.repository == 'internetarchive/brozzler'
+    steps:
+      - name: Dependabot metadata
+        id: metadata
+        uses: dependabot/fetch-metadata@d7267f607e9d3fb96fc2fbe83e0af444713e90b7
+        with:
+          github-token: "${{ secrets.GITHUB_TOKEN }}"
+      - name: Auto-approve PR
+        run: gh pr review --approve "$PR_URL"
+        env:
+          PR_URL: ${{ github.event.pull_request.html_url }}
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

dependabot.yml

@@ -0,0 +1,9 @@
+version: 2
+updates:
+  - package-ecosystem: "uv"
+    directory: "/"
+    schedule:
+      interval: "daily"
+    target-branch: "qa"
+    allow:
+      - dependency-name: yt-dlp