Bump to 2.16.0.dev0 #3285

Job	Run time
build (ubuntu-latest, 3.9)	7m 1s
Test Lint	43s
Test Docs	1m 3s
Test Minimum Versions	4m 55s
Check Links	4m 33s
build (ubuntu-latest, 3.11)	7m 7s
build (ubuntu-latest, 3.12)	8m 7s
check_release	1m 58s
build (windows-latest, 3.9)	7m 32s
build (windows-latest, 3.11)	7m 43s
build (windows-latest, 3.12)	12m 58s
integration_check (ubuntu-latest, 3.9)	2m 18s
build (macos-latest, 3.9)	5m 3s
integration_check (ubuntu-latest, 3.10)	2m 14s
build (macos-latest, 3.11)	5m 8s
integration_check (ubuntu-latest, 3.11)	2m 9s
build (macos-latest, 3.12)	5m 13s
integration_check (ubuntu-latest, 3.12)	2m 31s
build (ubuntu-latest, pypy-3.9)	11m 25s
build (macos-latest, 3.10)	5m 25s
Make SDist	20s
Test Examples	51s
Test Prereleases	4m 27s
integration_check_pypy	1m 0s
Install from SDist and Test	4m 37s
coverage	15s
tests_check	2s
	1h 56m 38s

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