devel/simdjson: update to 4.6.11

A bug fix release fixing an issue on older FreeBSD ppc* as
well as several other issues.

Changelog: https://github.com/simdjson/simdjson/releases/tag/v4.6.10
Changelog: https://github.com/simdjson/simdjson/releases/tag/v4.6.11

MFH: 2026Q3
Event: Berlin Hackathon 202609
Reported by: pkubaj