Tests

Allow empty type applications for ParamSpec #20088

Job	Run time
Test mypyc suite with 32-bit Python	9m 46s
Test suite with py311-ubuntu	9m 7s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 49s
Formatting and code style with Black + ruff	1m 56s
Test suite with py314-ubuntu, mypyc-compiled	14m 46s
Test suite with py313-ubuntu, mypyc-compiled	14m 30s
mypyc runtime tests with py313-macos	6m 4s
Parallel tests with py314-ubuntu, interpreted	22m 49s
Test suite with py310-ubuntu, mypyc-compiled	15m 53s
Test suite with py314t-ubuntu, mypyc-compiled	17m 58s
Type check our own code (py310-windows-64)	2m 37s
Test suite with py314-windows-64	25m 18s
mypyc runtime tests with py310-ubuntu	5m 29s
Test suite with py312-ubuntu	9m 55s
Type check our own code (py310-ubuntu)	1m 38s
	3h 6m 35s

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