net/py-h11: Update version 0.14.0=>0.16.0

- This addresses fix for CVE-2025-43859 — a critical vulnerability
  affecting HTTP/1.1 connection handling.

- This update may break ports that depend on older h11 APIs, as some
  interfaces and behaviors have changed in the new release.

Ports known or suspected to be affected should be tested carefully and
updated accordingly. A heads-up will also be sent to ports@.

Quarterly merge should take place after all the downstream ports have
been fixed for building.

Security: CVE-2025-43859
Changelog: https://github.com/python-hyper/h11/releases/tag/v0.16.0
MFH:	2025Q2