Decrease dist fetch interval
Decrease dist fetch interval

The original limit was to account for us having more dists in the future,
but there's actually an API end point we can poll to figure out the
limits. So reduce the interval for now and will implement smarter
rate limiter that uses that endpoint later.
perl6/modules.perl6.org,perl6/modules.perl6.org,perl6/modules.perl6.org,perl6/modules.perl6.org