Downgrade Pandoc setup action version to v2

Author: michmx

.github/workflows/arxiv-draft.yml

@@ -16,7 +16,7 @@ jobs:
 
       # Install Pandoc
       - name: Setup Pandoc
-        uses: r-lib/actions/setup-pandoc@v3
+        uses: r-lib/actions/setup-pandoc@v2
 
       # Install standard TeX Live
       - name: Install TeX Live