action cache v4

Author: andybeet

.github/workflows/manage_cache.yaml

@@ -21,7 +21,7 @@ jobs:
           sudo apt-get install  libgdal-dev libcurl4-gnutls-dev libgit2-dev libudunits2-dev
 
       - name: Check cached R packages
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         id: cache
         with:
           path: ${{ env.R_LIBS_USER }}