Update dependabot/fetch-metadata action to v2

Author: renovate[bot]

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

@@ -13,7 +13,7 @@ jobs:
 
       - name: Dependabot metadata
         id: metadata
-        uses: dependabot/fetch-metadata@v1.6.0
+        uses: dependabot/fetch-metadata@v2.4.0
         with:
           github-token: "${{ secrets.GITHUB_TOKEN }}"