Tests

update version to 2.9.1 #1929

Job	Run time
Test mypyc suite with 32-bit Python	7m 28s
Test suite with py38-ubuntu, mypyc-compiled	24m 49s
Test suite with py38-windows-64	31m 45s
Test suite with py39-ubuntu	31m 14s
Test suite with py310-ubuntu	30m 10s
Test suite with py311-ubuntu, mypyc-compiled	21m 21s
Test suite with py312-ubuntu, mypyc-compiled	24m 6s
Test suite with py313-ubuntu, mypyc-compiled	23m 11s
mypyc runtime tests with py39-macos	6m 49s
Type check our own code (py38-ubuntu)	3m 49s
Type check our own code (py38-windows-64)	4m 0s
Formatting and code style with Black + ruff	1m 2s
	3h 29m 44s

Provide feedback