ci fix

Author: ctomkow

.github/workflows/jsonparse-buildtest.yml

@@ -17,6 +17,7 @@ jobs:
       image: python:2.7.18-buster  # include 2.7 because I saw a download on PyPi stats.
 
     steps:
+      - uses: actions/checkout@v3
       - name: Install dependencies
         run: |
           pip install .[buildtest27_library]