Change GH actions workflow to include dependencies for PDF rendering

.github/workflows/publish.yml

@@ -26,7 +26,7 @@ jobs:
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
       - name: Check out repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       # Runs a single command using the runners shell
       # - name: Run a one-line script
@@ -46,6 +46,13 @@ jobs:
           # uncomment below and fill to pin a version
           # version: SPECIFIC-QUARTO-VERSION-HERE
 
+      - name: Download R dependencies for rendering to PDF
+        uses: r-lib/actions/setup-r-dependencies@v2
+        with:
+          packages:
+            any::rmarkdown
+            any::knitr
+
       - name: Publish to GitHub Pages (and render)
         uses: quarto-dev/quarto-actions/publish@v2
         with: