final preparation for v4.15.2 release (#2569) #8322

Job	Run time
CPython 3.13t-ubuntu-latest	11m 38s
CPython pypy-3.10-ubuntu-latest	12m 33s
CPython 3.9-ubuntu-latest	11m 31s
static	3m 54s
Test async's minimum dependencies and Python	43s
DocTest	1m 5s
Link Check	2m 39s
Test using minimum dependencies and supported Python	35s
Docs Checks	39s
Typing Tests (3.11)	58s
Make an sdist	10s
Typing Tests (3.9)	1m 6s
Install from SDist and Test	43s
	48m 14s

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