Fix typo. Config must be a valid regex

.github/workflows/port_merged_pull_request.yml

@@ -38,7 +38,7 @@ jobs:
           pull_description: 'Port of #${pull_number} by @${pull_author} to `${target_branch}`.'
           # Copy all labels from original PR to (newly created) port PR
           # NOTE: The labels matching 'label_pattern' are automatically excluded
-          copy_labels_pattern: '*'
+          copy_labels_pattern: '.*'
           # Use a personal access token (PAT) to create PR as 'dspace-bot' user.
           # A PAT is required in order for the new PR to trigger its own actions (for CI checks)
           github_token: ${{ secrets.PR_PORT_TOKEN }}