Merge pull request TheAlgorithms#221 from vil02/update_actions-checkout_to_v4

chore: update `actions/checkout` to `v4`

Author: vzvu3k6k

.github/workflows/test.yml

@@ -4,7 +4,7 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: '3.2'