Caching: raise the default Redis timeout

[Geal]

It is set to 2ms right now, which is far too low for some users. https://github.com/apollographql/router/blob/dev/apollo-router/src/cache/redis.rs#L165

They can modify it themselves, but it tends to trip them up. We should set a larger timeout, and let users who want tighter deadlines configure it instead