Simplify auto-merge workflow for Dependabot

Removed approval step before auto-merging Dependabot PRs.

Signed-off-by: BJ Hargrave <hargrave@us.ibm.com>

Author: bjhargrave

.github/workflows/dependabot_merge.yaml

@@ -32,7 +32,6 @@ jobs:
       - name: "Enable auto-merge"
         if: ${{ contains(fromJSON('["version-update:semver-minor","version-update:semver-patch"]'), steps.dependabot-metadata.outputs.update-type) }}
         run: |
-          gh pr review --approve "$PR_URL"
           gh pr merge --auto --rebase "$PR_URL"
         env:
           PR_URL: ${{github.event.pull_request.html_url}}