update CI configuration

Author: ivailop

.github/workflows/ci.yml

@@ -11,11 +11,11 @@ jobs:
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: '2.3'
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: testspace-com/setup-testspace@v1
         with:
           domain: samples
-      - uses: actions/cache@v3
+      - uses: actions/cache@v4
         with:
           path: vendor/bundle
           key: ${{ runner.os }}-gems-${{ hashFiles('Gemfile.lock') }}