Update ci.yml

Author: studioromeo

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - uses: ruby/setup-ruby@v1
-      - uses: actions/cache@v1
+      - uses: actions/cache@v4
         with:
           path: vendor/bundle
           key: bundle-${{ hashFiles('**/Gemfile.lock') }}