Tests

Allow empty type applications for ParamSpec #20089

Job	Run time
Test mypyc suite with 32-bit Python	9m 57s
Test suite with py314t-ubuntu, mypyc-compiled	17m 30s
Test suite with py310-ubuntu, mypyc-compiled	16m 1s
Test suite with py313-ubuntu, mypyc-compiled	14m 12s
Test suite with py311-ubuntu	9m 42s
Test suite with py314-ubuntu, mypyc-compiled	15m 11s
Test suite with py312-ubuntu	10m 9s
mypyc runtime tests with py310-ubuntu	5m 36s
mypyc runtime tests with py313-macos	6m 30s
Type check our own code (py310-ubuntu)	1m 48s
Parallel tests with py314-ubuntu, interpreted	25m 53s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 24s
Formatting and code style with Black + ruff	1m 55s
Test suite with py314-windows-64	27m 46s
Type check our own code (py310-windows-64)	2m 25s
	3h 12m 59s

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