Merge pull request #915 from puppetlabs/CONT-903-use_checkoutv3_docker

(CONT-903) Use checkout@v3 in docker

Author: david22swan

.github/workflows/ci.yml

@@ -31,7 +31,7 @@ jobs:
 
     steps:
       - name: Checkout Source
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Activate Ruby 2.7
         uses: ruby/setup-ruby@v1