fix: #1168 bump kiwisolver to 1.5.0 for python 3.14 wheels (#1210)

kiwisolver 1.4.8 ships no cp314 wheels, so `uv sync --frozen` in the
docker-hub pipeline tries to build it from source and fails. 1.5.0
adds cp314 wheels, which is what the python:3.14-slim builder needs.
The bump is transitive (kiwisolver is pulled in by matplotlib) and
the rest of the resolution is unchanged.

Closes #1168

Author: kreinba