Bump actions/cache to v4 (#24)

Author: moyner

.github/workflows/CI.yml

@@ -26,7 +26,7 @@ jobs:
         with:
           version: ${{ matrix.version }}
           arch: ${{ matrix.arch }}
-      - uses: actions/cache@v1
+      - uses: actions/cache@v4
         env:
           cache-name: cache-artifacts
         with: