[PROJ] PSC Motion: require SQLite 3.11 as minimum version

[Even Rouault]

> This isn’t an optional requirement for
> Proj6, basically it’s an unusably bad performance regression, so using
> Proj6 requires a newer SQLite given current state.

Agreed. This probably mostly affects RHEL 7 which, while not being antiquated 
from the point of view of RedHat's release policies, still ships with outdated 
components by todays' standards. So RHEL 7 users have two options: use PROJ 
5.x or PROJ 6 + backported SQLite.

> The Motion is sort of
> beside the point, it’s just a technical fact.

This motion is mostly purely procedural to be in compliance with
"Changing the version requirements for a dependency needs to be approved by 
the PSC."
of https://proj.org/community/rfc/rfc-3.html as Kristian reminded me.

Even

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