Remove auto-approve from dependabot-auto-merge workflow

Drop the gh pr review --approve step and only enable auto-merge,
requiring a human approval before the PR merges.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: adthom

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

@@ -20,11 +20,9 @@ jobs:
         with:
           github-token: "${{ secrets.GITHUB_TOKEN }}"
 
-      - name: Approve and auto-merge patch/minor updates
+      - name: Enable auto-merge for patch/minor updates
         if: steps.metadata.outputs.update-type == 'version-update:semver-patch' || steps.metadata.outputs.update-type == 'version-update:semver-minor'
-        run: |
-          gh pr review --approve "$PR_URL"
-          gh pr merge --auto --squash "$PR_URL"
+        run: gh pr merge --auto --squash "$PR_URL"
         env:
           PR_URL: ${{ github.event.pull_request.html_url }}
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}