Add references.bib to preview workflow paths filter

Co-authored-by: d-morrison <2474437+d-morrison@users.noreply.github.com>

Author: Copilot

.github/workflows/preview.yml

@@ -15,6 +15,7 @@ on:
       - '.github/workflows/publish.yml'
       - '*.qmd'
       - '*.css'
+      - 'references.bib'
 
 concurrency: preview-${{ github.ref }}