use actions/cache@v4

Author: mohawk2

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v2
       - name: Cache ~/perl5
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           key: ${{ runner.os }}-dist-locallib
           path: ~/perl5