Bump version to 4.16.1.dev0 #2881

Job	Run time
Build docs	10s
Run tests (pypy3.10)	33s
Run tests (3.10.4)	25s
Run tests (3.10)	17s
Run tests (pypy3.9)	29s
Run tests (3.9)	20s
Run tests (3.13)	17s
Run tests (3.11)	19s
Run tests (3.12.0)	21s
Run tests (3.9.12)	23s
Run tests (3.13.0)	23s
Run tests (3.12)	19s
Run tests (3.14)	15s
Run tests (3.11.0)	19s
Run tests (pypy3.11)	21s
Create an issue if daily tests failed	0s
	5m 11s

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