[postgis-devel] Postgis 3.1 minimum requirements update

[Christoph Berg]

Re: Sebastiaan Couwenberg 2019-11-11 <7081af6b-5dfb-fad8-2551-b7121c1af94c at xs4all.nl>
> The pgapt builds provided by Christoph for older releases are more
> likely to encounter issues with more recent library requirements.

I can follow suit and upgrade some libs, but I appreciate any efforts
to stay compatible with lib versions that aren't the very latest, so
we don't have to bump everything to bleeding edge.

Christoph