update github action

Author: CarloLucibello

.github/workflows/CI.yml

@@ -24,12 +24,12 @@ jobs:
     env:              # Don't use system Python (needed by PyCall)
       PYTHON: ""
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: julia-actions/setup-julia@v1
         with:
           version: ${{ matrix.version }}
           arch: ${{ matrix.arch }}
-      - uses: actions/cache@v1
+      - uses: actions/cache@v3
         env:
           cache-name: cache-artifacts
         with: