chore(deps): update actions/checkout action to v4 (#484)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/run_system_tests.yml

@@ -21,7 +21,7 @@ jobs:
     timeout-minutes: 90
     steps:
       - name: Check out repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Install dependencies
         run: poetry install
       - name: Run system tests