Merge pull request #2329 from ruby/dependabot/github_actions/actions/checkout-4

Bump actions/checkout from 2 to 4

Author: soutaro

.github/workflows/ruby.yml

@@ -83,7 +83,7 @@ jobs:
   valgrind:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: "3.4"