Update murdock/job.py

Co-authored-by: Alexandre Abadie <alexandre.abadie@inria.fr>

murdock/job.py

@@ -26,7 +26,7 @@ def __init__(
         config: MurdockSettings = MurdockSettings(),
         trigger: Optional[str] = "api",
         triggered_by: Optional[str] = None,
-        user_env: Optional[dict[str, str]] = None,
+        user_env: Optional[Dict[str, str]] = None,
     ):
         self.trigger: Optional[str] = trigger
         self.triggered_by: Optional[str] = triggered_by