devel/py-apispec: Update 6.9.0 => 6.10.0

Changelog:
https://github.com/marshmallow-code/apispec/blob/dev/CHANGELOG.rst#6100-2026-03-06

PR: 294384
Reported by: Goran Mekić <meka@tilda.center> (maintainer)
Approved by: osa (mentor)
MFH: 2026Q2

(cherry picked from commit 2f50f736d954c5b9330cc11ce4f69989630ac5d5)