[CI] Updates actions/checkout

Author: picandocodigo

.github/workflows/7x_tests.yml

@@ -20,7 +20,7 @@ jobs:
         ruby: [ '2.6', '2.7', '3.0' ]
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Increase system limits
       run: |
         sudo swapoff -a