Pin Markupsafe until we are able to upgrade Flask/Jinja (#21664)
Pin Markupsafe until we are able to upgrade Flask/Jinja (#21664)

Markupsafe 2.1.0 breaks with error: import name 'soft_unicode' from 'markupsafe'.
This should be removed when either this issue is closed:
https://github.com/pallets/markupsafe/issues/284
or when we will be able to upgrade JINJA to newer version (currently
limited due to Flask and Flask Application Builder)
danielvdende/incubator-airflow,nathanielvarona/airflow,apache/airflow,danielvdende/incubator-airflow,Acehaidrey/incubator-airflow,cfei18/incubator-airflow,cfei18/incubator-airflow,nathanielvarona/airflow,Acehaidrey/incubator-airflow,cfei18/incubator-airflow,nathanielvarona/airflow,apache/airflow,Acehaidrey/incubator-airflow,apache/airflow,bolkedebruin/airflow,lyft/incubator-airflow,apache/airflow,bolkedebruin/airflow,Acehaidrey/incubator-airflow,apache/airflow,cfei18/incubator-airflow,lyft/incubator-airflow,lyft/incubator-airflow,bolkedebruin/airflow,apache/airflow,Acehaidrey/incubator-airflow,nathanielvarona/airflow,cfei18/incubator-airflow,danielvdende/incubator-airflow,cfei18/incubator-airflow,Acehaidrey/incubator-airflow,danielvdende/incubator-airflow,bolkedebruin/airflow,danielvdende/incubator-airflow,bolkedebruin/airflow,danielvdende/incubator-airflow,nathanielvarona/airflow,lyft/incubator-airflow,nathanielvarona/airflow