cron diagnostics: increase timeout
cron diagnostics: increase timeout

If a real cron is configured, it will take up to a minute until it is
run. Now the total checking time is 75s, up from 30, which should cover
it.

katrinleinweber/podlove-publisher,katrinleinweber/podlove-publisher,podlove/podlove-publisher,katrinleinweber/podlove-publisher,katrinleinweber/podlove-publisher,podlove/podlove-publisher,podlove/podlove-publisher,podlove/podlove-publisher,katrinleinweber/podlove-publisher,podlove/podlove-publisher,podlove/podlove-publisher