Merge pull request #29 from r-plus/patch-1

update actions/checkout v4 to fix Node.js 16 deprecated warning.

action.yml

@@ -43,7 +43,7 @@ runs:
       with:
         bundler-cache: true
         ruby-version: 3.1
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         # We want to always get the default branch ref.
         ref: "${{ github.event.pull_request.base.ref }}"