Merge pull request #5180 from DSpace/dependabot/github_actions/dspace-8_x/korthout/backport-action-4

Bump korthout/backport-action from 2 to 4

Author: tdonohue

.github/workflows/port_merged_pull_request.yml

@@ -27,7 +27,7 @@ jobs:
       # Port PR to other branch (ONLY if labeled with "port to")
       # See https://github.com/korthout/backport-action
       - name: Create backport pull requests
-        uses: korthout/backport-action@v2
+        uses: korthout/backport-action@v4
         with:
           # Trigger based on a "port to [branch]" label on PR
           # (This label must specify the branch name to port to)