Fix mypy checks for api_connexion

Part of apache#19891

airflow/api_connexion/endpoints/dag_endpoint.py

@@ -32,7 +32,6 @@
 from airflow.exceptions import AirflowException, DagNotFound
 from airflow.models.dag import DagModel, DagTag
 from airflow.security import permissions
-from airflow.settings import Session
 from airflow.utils.session import provide_session
 
 
@@ -111,15 +110,15 @@ def patch_dag(session, dag_id, update_mask=None):
 
 @security.requires_access([(permissions.ACTION_CAN_DELETE, permissions.RESOURCE_DAG)])
 @provide_session
-def delete_dag(dag_id: str, session: Session):
+def delete_dag(dag_id: str, session):
     """Delete the specific DAG."""
     # TODO: This function is shared with the /delete endpoint used by the web
     # UI, so we're reusing it to simplify maintenance. Refactor the function to
     # another place when the experimental/legacy API is removed.
-    from airflow.api.common.experimental import delete_dag
+    from airflow.api.common.experimental import delete_dag as delete_dag_module
 
     try:
-        delete_dag.delete_dag(dag_id, session=session)
+        delete_dag_module.delete_dag(dag_id, session=session)
     except DagNotFound:
         raise NotFound(f"Dag with id: '{dag_id}' not found")
     except AirflowException:

airflow/api_connexion/schemas/dag_schema.py

@@ -86,7 +86,7 @@ class DAGDetailSchema(DAGSchema):
     doc_md = fields.String()
     default_view = fields.String()
     params = fields.Method('get_params', dump_only=True)
-    tags = fields.Method("get_tags", dump_only=True)
+    tags = fields.Method("get_tags", dump_only=True)  # type: ignore
     is_paused = fields.Method("get_is_paused", dump_only=True)
     is_active = fields.Method("get_is_active", dump_only=True)