chore(deps): update actions/checkout action to v3 (#90)

Author: renovate-bot

.github/workflows/run_tests.yml

@@ -26,7 +26,7 @@ jobs:
 
     steps:
       # check out repository
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - name: Set up Python 3.9
         uses: actions/setup-python@v4