Update buildjet/cache action from v3 to v4

Author: renovate[bot]

.github/workflows/push.yml

@@ -22,7 +22,7 @@ jobs:
           node-version: '20.9'
 
       - name: 'Cache dependencies'
-        uses: buildjet/cache@v3
+        uses: buildjet/cache@v4
         with:
           path: '**/node_modules'
           key: ${{ runner.os }}-node_modules-${{ hashFiles('**/yarn.lock') }}