[AIRFLOW-XXXX] Add -- to rm in install_released_airflow_version (#7548)
[AIRFLOW-XXXX] Add -- to rm in install_released_airflow_version (#7548)

Adding this -- after rm -f helps in case when you have some weird
files that have spaces and -W in names.
wooga/airflow,DinoCow/airflow,danielvdende/incubator-airflow,airbnb/airflow,danielvdende/incubator-airflow,mistercrunch/airflow,dhuang/incubator-airflow,mrkm4ntr/incubator-airflow,DinoCow/airflow,sekikn/incubator-airflow,apache/airflow,cfei18/incubator-airflow,cfei18/incubator-airflow,lyft/incubator-airflow,sekikn/incubator-airflow,danielvdende/incubator-airflow,apache/airflow,lyft/incubator-airflow,apache/incubator-airflow,danielvdende/incubator-airflow,bolkedebruin/airflow,dhuang/incubator-airflow,wooga/airflow,mrkm4ntr/incubator-airflow,apache/incubator-airflow,mrkm4ntr/incubator-airflow,lyft/incubator-airflow,bolkedebruin/airflow,mrkm4ntr/incubator-airflow,cfei18/incubator-airflow,Acehaidrey/incubator-airflow,Acehaidrey/incubator-airflow,sekikn/incubator-airflow,mistercrunch/airflow,Acehaidrey/incubator-airflow,nathanielvarona/airflow,lyft/incubator-airflow,nathanielvarona/airflow,airbnb/airflow,sekikn/incubator-airflow,Acehaidrey/incubator-airflow,mistercrunch/airflow,danielvdende/incubator-airflow,mistercrunch/airflow,nathanielvarona/airflow,danielvdende/incubator-airflow,Acehaidrey/incubator-airflow,apache/incubator-airflow,nathanielvarona/airflow,airbnb/airflow,Acehaidrey/incubator-airflow,apache/airflow,nathanielvarona/airflow,cfei18/incubator-airflow,bolkedebruin/airflow,bolkedebruin/airflow,airbnb/airflow,dhuang/incubator-airflow,apache/airflow,cfei18/incubator-airflow,DinoCow/airflow,nathanielvarona/airflow,DinoCow/airflow,cfei18/incubator-airflow,apache/incubator-airflow,bolkedebruin/airflow,wooga/airflow,dhuang/incubator-airflow,apache/airflow,apache/airflow,wooga/airflow