Tests

update version to 2.9.1 #1943

Job	Run time
Test suite with py38-ubuntu, mypyc-compiled	4m 38s
Test suite with py38-windows-64	4m 25s
Test suite with py39-ubuntu	4m 38s
Test mypyc suite with 32-bit Python	4m 39s
Test suite with py310-ubuntu	4m 41s
Test suite with py311-ubuntu, mypyc-compiled	4m 39s
Test suite with py312-ubuntu, mypyc-compiled	4m 39s
Test suite with py313-ubuntu, mypyc-compiled	4m 39s
mypyc runtime tests with py39-macos	4m 38s
Type check our own code (py38-ubuntu)	4m 26s
Type check our own code (py38-windows-64)	4m 25s
Formatting and code style with Black + ruff	58s
	51m 25s

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