Merge pull request #187 from ruby/dependabot/github_actions/actions/checkout-3

Bump actions/checkout from 2 to 3

Author: hsbt

.github/workflows/ubuntu.yml

@@ -32,7 +32,7 @@ jobs:
           - "jruby-9.3.2.0"
           - "jruby-head"
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: ${{matrix.ruby}}