Update ci.yml (#459)

Author: josevalim

.github/workflows/ci.yml

@@ -32,7 +32,7 @@ jobs:
         otp-version: ${{ matrix.otp }}
 
     - name: Restore deps and _build cache
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
         path: |
           deps