Add 3.14 to project classifiers and tox.ini #2056

Job	Run time
Lint	6s
Run tests (3.9)	6s
Run tests (3.9.12)	15s
Run tests (3.10)	6s
Run tests (3.10.4)	13s
Run tests (3.11)	6s
Run tests (3.11.0)	13s
Run tests (3.12)	8s
Run tests (3.12.0)	13s
Run tests (3.13)	9s
Run tests (3.13.0)	17s
Run tests (3.14)	15s
Run tests (pypy3.9)	11s
Run tests (pypy3.10)	14s
Create an issue if daily tests failed	0s
	2m 32s

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