lang/python314: Update to 3.14.5

This release swaps out the incremental garbage collector for the
generational one used in 3.13 due to reports of memory pressure.

Backport the post-release upstream fix for:
Heap Buffer Overflow in pyexpat Character Data Buffering #148441
which is believed to be only triggered in rare circumstances.

Changelog: https://www.python.org/downloads/release/python-3145/

PR: 295200
MFH: 2026Q2