Update tests/conftest.py

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: nedseb

tests/conftest.py

@@ -56,7 +56,7 @@ def load_scenarios():
     scenarios_dir = Path(__file__).parent / "scenarios"
     scenarios = []
     for yaml_file in sorted(scenarios_dir.glob("*.yaml")):
-        with open(yaml_file) as f:
+        with open(yaml_file, encoding="utf-8") as f:
             scenario = yaml.safe_load(f)
             scenario["_file"] = yaml_file.name
             scenarios.append(scenario)