fix: update text around our on-hold process for packages where a maintainer hasn't responded in a period of time

[lwasser]

Allow a package review to remain open for up to a year (on hold) with 3 month check-ins following

The author can choose to have their submission put on hold (editor applies the holding label). The holding status will be revisited every 3 months, and after one year, the issue will be closed if no movement has occurred on the review.