change: upgrade airflow to 1.10.11 (#1830)

Author: metrizable

setup.py

@@ -70,7 +70,7 @@ def read_version():
         "awslogs",
         "black==19.10b0 ; python_version >= '3.6'",
         "stopit==1.1.2",
-        "apache-airflow==1.10.9",
+        "apache-airflow==1.10.11",
         "fabric>=2.0",
         "requests>=2.20.0, <3",
     ],