Bump hmarr/auto-approve-action from 3 to 4

Bumps [hmarr/auto-approve-action](https://github.com/hmarr/auto-approve-action) from 3 to 4.
- [Release notes](https://github.com/hmarr/auto-approve-action/releases)
- [Commits](hmarr/auto-approve-action@v3...v4)

---
updated-dependencies:
- dependency-name: hmarr/auto-approve-action
  dependency-version: '4'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/auto-merge.yml

@@ -25,7 +25,7 @@ jobs:
           sudo apt install -y gh jq
 
       - name: Auto approve PR
-        uses: hmarr/auto-approve-action@v3
+        uses: hmarr/auto-approve-action@v4
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}