Tests

TEST: Add foundation for TypeVar defaults (PEP 696) #276

Job	Run time
Test mypyc suite with 32-bit Python	7m 55s
Test suite with py38-ubuntu, mypyc-compiled	20m 9s
Test suite with py38-windows-64	28m 3s
Test suite with py39-ubuntu	19m 15s
Test suite with py310-ubuntu	18m 2s
Test suite with py311-ubuntu, mypyc-compiled	17m 22s
Test suite with py312-ubuntu, mypyc-compiled	20m 31s
mypyc runtime tests with py39-macos	8m 20s
mypyc runtime tests with py38-debug-build-ubuntu	5m 27s
Type check our own code (py38-ubuntu)	1m 44s
Type check our own code (py38-windows-64)	2m 24s
Formatting and code style with Black + ruff	33s
	2h 29m 45s

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