Increase timeout for waiting for images (#11460)
Increase timeout for waiting for images (#11460)

Now, when we have many more jobs to run, it might happen that
when a lot of PRs are submitted one-after-the-other there might
be longer waiting time for building the image.

There is only one waiting job per image type, so it does not
cost a lot to wait a bit longer, in order to avoid cancellation
after 50 minutes of waiting.
lyft/incubator-airflow,danielvdende/incubator-airflow,mrkm4ntr/incubator-airflow,bolkedebruin/airflow,lyft/incubator-airflow,airbnb/airflow,bolkedebruin/airflow,apache/airflow,apache/incubator-airflow,nathanielvarona/airflow,mistercrunch/airflow,dhuang/incubator-airflow,cfei18/incubator-airflow,airbnb/airflow,danielvdende/incubator-airflow,bolkedebruin/airflow,Acehaidrey/incubator-airflow,bolkedebruin/airflow,sekikn/incubator-airflow,mistercrunch/airflow,danielvdende/incubator-airflow,sekikn/incubator-airflow,dhuang/incubator-airflow,mistercrunch/airflow,apache/airflow,DinoCow/airflow,cfei18/incubator-airflow,airbnb/airflow,mistercrunch/airflow,airbnb/airflow,DinoCow/airflow,apache/airflow,danielvdende/incubator-airflow,Acehaidrey/incubator-airflow,apache/airflow,lyft/incubator-airflow,sekikn/incubator-airflow,cfei18/incubator-airflow,nathanielvarona/airflow,Acehaidrey/incubator-airflow,dhuang/incubator-airflow,mrkm4ntr/incubator-airflow,dhuang/incubator-airflow,DinoCow/airflow,nathanielvarona/airflow,apache/airflow,danielvdende/incubator-airflow,nathanielvarona/airflow,apache/incubator-airflow,cfei18/incubator-airflow,Acehaidrey/incubator-airflow,Acehaidrey/incubator-airflow,apache/incubator-airflow,nathanielvarona/airflow,sekikn/incubator-airflow,mrkm4ntr/incubator-airflow,nathanielvarona/airflow,danielvdende/incubator-airflow,DinoCow/airflow,cfei18/incubator-airflow,mrkm4ntr/incubator-airflow,apache/incubator-airflow,apache/airflow,bolkedebruin/airflow,Acehaidrey/incubator-airflow,lyft/incubator-airflow,cfei18/incubator-airflow