Tests

Start testing Python 3.14 (#19164) #15900

Job	Run time
Test mypyc suite with 32-bit Python	8m 28s
Test suite with py39-ubuntu, mypyc-compiled	16m 45s
Test suite with py39-windows-64	1m 11s
Test suite with py310-ubuntu	10m 47s
Test suite with py311-ubuntu	9m 0s
Test suite with py312-ubuntu, mypyc-compiled	15m 28s
Test suite with py313-ubuntu, mypyc-compiled	14m 57s
Test suite with py314-dev-ubuntu	16m 47s
mypyc runtime tests with py39-macos	4m 33s
Type check our own code (py39-ubuntu)	2m 7s
Type check our own code (py39-windows-64)	1m 14s
Formatting and code style with Black + ruff	2m 0s
	1h 43m 17s

Provide feedback