Bump version to 4.16.0rc2.dev #2869

Job	Run time
Run tests (3.12)	21s
Run tests (3.10.4)	19s
Run tests (3.12.0)	23s
Run tests (3.14)	16s
Run tests (pypy3.9)	21s
Run tests (pypy3.10)	27s
Run tests (3.11)	14s
Run tests (3.13.0)	19s
Run tests (3.9)	19s
Run tests (3.10)	16s
Run tests (3.9.12)	20s
Run tests (3.13)	20s
Run tests (pypy3.11)	35s
Build docs	14s
Run tests (3.11.0)	20s
Create an issue if daily tests failed	-1s
	5m 3s

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