Prepare release 4.15.0rc1 #2265

Job	Run time
Run tests (3.9.12)	16s
Run tests (3.9)	7s
Run tests (3.13.0)	17s
Run tests (3.11.0)	14s
Run tests (3.12.0)	19s
Run tests (3.10.4)	14s
Run tests (3.11)	9s
Run tests (pypy3.10)	13s
Run tests (3.10)	10s
Run tests (3.14)	20s
Run tests (pypy3.11)	10s
Run tests (pypy3.9)	9s
Run tests (3.12)	7s
Run tests (3.13)	8s
Create an issue if daily tests failed	0s
	2m 53s

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