improve typing for openfaas provider (#9883)
improve typing for openfaas provider (#9883)

Co-authored-by: Kamil Breguła <778b89a3582a5bad10b146dd5e664ccdc2685de8@users.noreply.github.com>
danielvdende/incubator-airflow,apache/incubator-airflow,danielvdende/incubator-airflow,DinoCow/airflow,lyft/incubator-airflow,lyft/incubator-airflow,nathanielvarona/airflow,lyft/incubator-airflow,sekikn/incubator-airflow,cfei18/incubator-airflow,cfei18/incubator-airflow,dhuang/incubator-airflow,apache/incubator-airflow,sekikn/incubator-airflow,lyft/incubator-airflow,apache/airflow,cfei18/incubator-airflow,sekikn/incubator-airflow,dhuang/incubator-airflow,Acehaidrey/incubator-airflow,apache/incubator-airflow,DinoCow/airflow,dhuang/incubator-airflow,Acehaidrey/incubator-airflow,Acehaidrey/incubator-airflow,nathanielvarona/airflow,mistercrunch/airflow,bolkedebruin/airflow,apache/airflow,airbnb/airflow,apache/airflow,mrkm4ntr/incubator-airflow,apache/airflow,apache/incubator-airflow,airbnb/airflow,danielvdende/incubator-airflow,mistercrunch/airflow,apache/airflow,mistercrunch/airflow,cfei18/incubator-airflow,danielvdende/incubator-airflow,apache/airflow,Acehaidrey/incubator-airflow,mrkm4ntr/incubator-airflow,airbnb/airflow,bolkedebruin/airflow,sekikn/incubator-airflow,nathanielvarona/airflow,bolkedebruin/airflow,nathanielvarona/airflow,nathanielvarona/airflow,mrkm4ntr/incubator-airflow,nathanielvarona/airflow,DinoCow/airflow,bolkedebruin/airflow,mistercrunch/airflow,cfei18/incubator-airflow,DinoCow/airflow,Acehaidrey/incubator-airflow,danielvdende/incubator-airflow,airbnb/airflow,danielvdende/incubator-airflow,dhuang/incubator-airflow,Acehaidrey/incubator-airflow,mrkm4ntr/incubator-airflow,cfei18/incubator-airflow,bolkedebruin/airflow