cache action version

Author: wlandau-lilly

.github/workflows/render.yaml

@@ -18,7 +18,7 @@ jobs:
       - uses: quarto-dev/quarto-actions/setup@v2
 
       - name: Cache results
-        uses: actions/cache@v2
+        uses: actions/cache@v4.1.2
         with:
           path: |
             _book