ci: Update actions/cache to version 4

Author: leanfrancucci

.github/workflows/compliance.yml

@@ -20,7 +20,7 @@ jobs:
             ref: ${{ github.event.pull_request.head.sha }}
             fetch-depth: 0
         - name: cache-pip
-          uses: actions/cache@v1
+          uses: actions/cache@v4
           with:
             path: ~/.cache/pip
             key: ${{ runner.os }}-doc-pip