Tests

Mention 3.9 support ending soon in 1.19 release notes #19521

Job	Run time
Test mypyc suite with 32-bit Python	8m 31s
Test suite with py39-ubuntu, mypyc-compiled	14m 34s
Test suite with py313-ubuntu, mypyc-compiled	13m 58s
Test suite with py311-ubuntu	8m 54s
Test suite with py310-ubuntu	12m 9s
Test suite with py314-windows-64	28m 2s
Type check our own code (py39-windows-64)	2m 22s
Test suite with py312-ubuntu, mypyc-compiled	14m 51s
Test suite with py314-ubuntu, mypyc-compiled	14m 10s
mypyc runtime tests with py313-macos	5m 51s
Formatting and code style with Black + ruff	1m 56s
Type check our own code (py39-ubuntu)	1m 41s
mypyc runtime tests with py310-ubuntu	5m 1s
	2h 12m 0s

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