Change workflow scheduled time to more "random" minute

Change workflow scheduled time to more "random" minute

According to GitHub documentation:

> The schedule event can be delayed during periods of high loads of
> GitHub Actions workflow runs. High load times include the start of
> every hour. If the load is sufficiently high enough, some queued jobs
> may be dropped. To decrease the chance of delay, schedule your
> workflow to run at a different time of the hour.

During initial tests it turned out that during peak hours the schedule
didn't execute.

Change-Id: Idcbaed6fc43cf517f616842b7ed7acc7886bea13
Signed-off-by: Marek Pikuła <m.pikula@partner.samsung.com>