[AIRFLOW-4516] K8s runAsUser and fsGroup cannot be strings (#5429)
[AIRFLOW-4516] K8s runAsUser and fsGroup cannot be strings (#5429)

The securityContext sections  for runAsUser and fsGroup in Pod
definitions are always integers. This PR updates makes sure
the configuration returns an integer for both runAsUser and
fsGroup.
sekikn/incubator-airflow,cfei18/incubator-airflow,apache/incubator-airflow,apache/airflow,Acehaidrey/incubator-airflow,lyft/incubator-airflow,apache/incubator-airflow,danielvdende/incubator-airflow,sekikn/incubator-airflow,mrkm4ntr/incubator-airflow,Fokko/incubator-airflow,apache/incubator-airflow,apache/airflow,nathanielvarona/airflow,cfei18/incubator-airflow,nathanielvarona/airflow,Acehaidrey/incubator-airflow,wileeam/airflow,wooga/airflow,mrkm4ntr/incubator-airflow,spektom/incubator-airflow,mrkm4ntr/incubator-airflow,wooga/airflow,apache/airflow,spektom/incubator-airflow,apache/airflow,wooga/airflow,mistercrunch/airflow,nathanielvarona/airflow,cfei18/incubator-airflow,Acehaidrey/incubator-airflow,mistercrunch/airflow,dhuang/incubator-airflow,cfei18/incubator-airflow,apache/incubator-airflow,mtagle/airflow,mrkm4ntr/incubator-airflow,spektom/incubator-airflow,sekikn/incubator-airflow,mtagle/airflow,danielvdende/incubator-airflow,airbnb/airflow,dhuang/incubator-airflow,airbnb/airflow,wileeam/airflow,DinoCow/airflow,dhuang/incubator-airflow,bolkedebruin/airflow,lyft/incubator-airflow,danielvdende/incubator-airflow,sekikn/incubator-airflow,DinoCow/airflow,cfei18/incubator-airflow,Fokko/incubator-airflow,wileeam/airflow,airbnb/airflow,DinoCow/airflow,Acehaidrey/incubator-airflow,mistercrunch/airflow,spektom/incubator-airflow,mistercrunch/airflow,nathanielvarona/airflow,bolkedebruin/airflow,bolkedebruin/airflow,Acehaidrey/incubator-airflow,nathanielvarona/airflow,wileeam/airflow,nathanielvarona/airflow,bolkedebruin/airflow,apache/airflow,Fokko/incubator-airflow,Fokko/incubator-airflow,lyft/incubator-airflow,mtagle/airflow,cfei18/incubator-airflow,airbnb/airflow,dhuang/incubator-airflow,lyft/incubator-airflow,bolkedebruin/airflow,apache/airflow,danielvdende/incubator-airflow,Acehaidrey/incubator-airflow,danielvdende/incubator-airflow,danielvdende/incubator-airflow,mtagle/airflow,wooga/airflow,DinoCow/airflow