PYTHON-5585 Set linkcheck_allow_unauthorized #8329

Job	Run time
static	3m 50s
CPython 3.13t-ubuntu-latest	11m 31s
Test minimum dependencies and Python	43s
DocTest	1m 6s
CPython pypy-3.10-ubuntu-latest	12m 28s
CPython 3.10-ubuntu-latest	11m 40s
Typing Tests (3.10)	57s
Docs Checks	42s
Make an sdist	16s
Integration Tests	1m 6s
Typing Tests (3.11)	55s
Link Check	1m 39s
Install from SDist and Test	1m 1s
	47m 54s

Provide feedback