Merge pull request #2248 from github/dependabot-github_actions-action…

…s-checkout-v2.3.4

Bump actions/checkout from v1 to v2.3.4

.github/workflows/tests.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Set up Git repository
-      uses: actions/checkout@v1
+      uses: actions/checkout@v2.3.4
 
     - name: Set up Ruby
       uses: actions/setup-ruby@v1