Merge pull request #106 from fluent/dependabot/github_actions/actions/checkout-4

Bump actions/checkout from 3 to 4

Author: ashie

.github/workflows/unit-test.yml

@@ -18,7 +18,7 @@ jobs:
             ruby: 3.2
     name: Ruby ${{ matrix.ruby }} unit testing on ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: ${{ matrix.ruby }}