Merge pull request #200 from github/dependabot/github_actions/actions/checkout-3

Bump actions/checkout from 2 to 3

Author: zerowidth

.github/workflows/ci.yml

@@ -25,7 +25,7 @@ jobs:
           - "3.1"
           - "3.2"
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby_version }}