update cache action version

Author: rdboyes

.github/workflows/Documenter.yml

@@ -22,7 +22,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - uses: julia-actions/setup-julia@v1
-      - uses: julia-actions/cache@v1
+      - uses: julia-actions/cache@v2
         with:
           cache-registries: "false"
       - name: Install documentation dependencies