Prepare 4.15 release #8136

Job	Run time
DocTest	1m 4s
Test using minimum dependencies and supported Python	43s
Typing Tests (3.9)	1m 6s
Docs Checks	44s
Test async's minimum dependencies and Python	40s
CPython 3.9-ubuntu-latest	11m 39s
Make an sdist	11s
CPython pypy-3.10-ubuntu-latest	12m 53s
Typing Tests (3.11)	1m 5s
CPython 3.13t-ubuntu-latest	11m 51s
static	5m 4s
Link Check	4m 36s
Install from SDist and Test	59s
	52m 35s

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