Fix mypy

astronomer/providers/core/sensors/astro.py

@@ -62,7 +62,7 @@ def poke(self, context: Context) -> bool | PokeReturnValue:
         if dag_runs is None or len(dag_runs) == 0:
             self.log.info(f"No dag-runs found for dag-id {self.external_dag_id}")
             return True
-        self._dag_run_id = dag_runs[0].get("dag_run_id")
+        self._dag_run_id: str = dag_runs[0]["dag_run_id"]
         if self.external_task_id is not None:
             task_instance = hook.get_task_instance(
                 self.external_dag_id, self._dag_run_id, self.external_task_id