update cache version

Author: JacksonBurns

.github/workflows/CI.yml

@@ -29,16 +29,7 @@ jobs:
         with:
           channel: '1.9'
 
-      - uses: actions/cache@v1
-        env:
-          cache-name: cache-artifacts
-        with:
-          path: ~/.julia/artifacts
-          key: ${{ runner.os }}-test-${{ env.cache-name }}-${{ hashFiles('**/Project.toml') }}
-          restore-keys: |
-            ${{ runner.os }}-test-${{ env.cache-name }}-
-            ${{ runner.os }}-test-
-            ${{ runner.os }}-
+      - uses: julia-actions/cache@v2
 
       - name: Set some env vars
         run: |