ci: rename test action

Author: kelly-sovacool

.github/workflows/tests.yml

@@ -10,7 +10,7 @@ jobs:
   tests:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v3
 
       - name: Parse environment.json and set Docker image
         id: docker_image