Fix R CMD check workflow (#1851)

For bookdown package update, which now requires R > 3.5

Author: IndrajeetPatil

.github/workflows/R-CMD-check.yaml

@@ -70,7 +70,9 @@ jobs:
 
       - uses: r-lib/actions/setup-r-dependencies@v2
         with:
-          extra-packages: any::rcmdcheck
+          extra-packages: |
+            any::rcmdcheck
+            bookdown=?ignore-before-r=3.5.0
           needs: check
 
       - uses: r-lib/actions/check-r-package@v2