Upgrade cache action from v2 to v4

Author: norberttech

.github/workflows/changelog-update.yml

@@ -20,7 +20,7 @@ jobs:
         uses: "actions/checkout@v6"
 
       - name: "Restore Automation cache"
-        uses: "actions/cache@v2"
+        uses: "actions/cache@v4"
         with:
           path: |
             cache