devel/simdjson: update to 4.6.5
A bug fix release.
While we are at it, at textproc as a secondary category.
Changelog: https://github.com/simdjson/simdjson/releases/tag/v4.6.5
MFH: 2026Q3
(cherry picked from commit 86760b52fb8c5935f7cfc6ed276337528554a22f)