Prepare release 4.15.0rc1 (#650) #2268

Job	Run time
Run tests (3.9)	7s
Run tests (3.11)	8s
Run tests (3.12)	10s
Run tests (3.14)	19s
Run tests (3.13)	10s
Run tests (3.13.0)	18s
Run tests (3.11.0)	17s
Run tests (pypy3.9)	11s
Run tests (3.10)	9s
Run tests (pypy3.11)	12s
Run tests (3.10.4)	18s
Run tests (3.9.12)	17s
Run tests (pypy3.10)	8s
Run tests (3.12.0)	17s
Create an issue if daily tests failed	-1s
	3m 0s

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