Tests

Allow empty type applications for ParamSpec #20095

Job	Run time
Test mypyc suite with 32-bit Python	9m 39s
Test suite with py313-ubuntu, mypyc-compiled	14m 45s
Test suite with py314-ubuntu, mypyc-compiled	15m 16s
Test suite with py310-ubuntu, mypyc-compiled	15m 44s
Test suite with py314t-ubuntu, mypyc-compiled	17m 19s
Test suite with py311-ubuntu	9m 19s
mypyc runtime tests with py313-macos	6m 24s
Formatting and code style with Black + ruff	2m 2s
Test suite with py312-ubuntu	9m 38s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 11s
mypyc runtime tests with py310-ubuntu	5m 33s
Test suite with py314-windows-64	27m 43s
Type check our own code (py310-ubuntu)	1m 39s
Type check our own code (py310-windows-64)	2m 15s
Parallel tests with py314-ubuntu, interpreted	23m 56s
	3h 8m 23s

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