Fix changelog tracking for dot files

After new release of the labeler action, changes to dot files are now
tracked.

This is available since v4.1. As we're tracking v4, it's going to be
automatically picked up and we can make use of the new option.

References actions/labeler#316

Fixes solidusio#4804

.github/workflows/triage_for_changelog.yml

@@ -13,6 +13,7 @@ jobs:
         with:
           repo-token: "${{ secrets.GITHUB_TOKEN }}"
           sync-labels: true
+          dot: true
   ensure:
     uses: "./.github/workflows/ensure_changelog_label.yml"
     needs: "triage"