Fixes failing tests for helm chart after changing default version (#15505)
Fixes failing tests for helm chart after changing default version (#15505)

After changing default Airflow version in #15497 the test started
failing. This change fixes it and makes the test works no matter
the version.
danielvdende/incubator-airflow,dhuang/incubator-airflow,apache/incubator-airflow,lyft/incubator-airflow,apache/incubator-airflow,apache/incubator-airflow,apache/airflow,bolkedebruin/airflow,apache/airflow,cfei18/incubator-airflow,mistercrunch/airflow,nathanielvarona/airflow,cfei18/incubator-airflow,danielvdende/incubator-airflow,nathanielvarona/airflow,bolkedebruin/airflow,apache/airflow,dhuang/incubator-airflow,nathanielvarona/airflow,mistercrunch/airflow,Acehaidrey/incubator-airflow,lyft/incubator-airflow,nathanielvarona/airflow,apache/airflow,dhuang/incubator-airflow,apache/incubator-airflow,danielvdende/incubator-airflow,Acehaidrey/incubator-airflow,cfei18/incubator-airflow,sekikn/incubator-airflow,apache/airflow,nathanielvarona/airflow,sekikn/incubator-airflow,bolkedebruin/airflow,cfei18/incubator-airflow,mistercrunch/airflow,bolkedebruin/airflow,mistercrunch/airflow,danielvdende/incubator-airflow,Acehaidrey/incubator-airflow,dhuang/incubator-airflow,danielvdende/incubator-airflow,Acehaidrey/incubator-airflow,cfei18/incubator-airflow,cfei18/incubator-airflow,sekikn/incubator-airflow,Acehaidrey/incubator-airflow,Acehaidrey/incubator-airflow,nathanielvarona/airflow,lyft/incubator-airflow,lyft/incubator-airflow,bolkedebruin/airflow,apache/airflow,danielvdende/incubator-airflow,sekikn/incubator-airflow