New review comment by ahesford on void-packages repository

https://github.com/void-linux/void-packages/pull/24067#discussion_r471174962

Comment:
In practice it probably doesn't matter much, but `>=` is best practice.

Holding the `-devel` package while still upgrading `${sourcepkg}` will, for example, still allow local static linking against an old version without risking breakage of dependants of `${sourceppkg}`. Sure, this is a contrived example, but why prohibit this behavior for no real benefit?