Tests

Allow empty type applications for ParamSpec #20094

Job	Run time
Test suite with py310-ubuntu, mypyc-compiled	3m 59s
Test mypyc suite with 32-bit Python	4m 0s
Test suite with py314t-ubuntu, mypyc-compiled	3m 59s
Parallel tests with py314-ubuntu, mypyc-compiled	3m 59s
mypyc runtime tests with py310-ubuntu	3m 59s
Test suite with py313-ubuntu, mypyc-compiled	3m 59s
mypyc runtime tests with py313-macos	4m 2s
Test suite with py314-windows-64	3m 40s
Type check our own code (py310-ubuntu)	1m 38s
Test suite with py311-ubuntu	3m 59s
Parallel tests with py314-ubuntu, interpreted	4m 0s
Test suite with py312-ubuntu	4m 0s
Test suite with py314-ubuntu, mypyc-compiled	4m 1s
Formatting and code style with Black + ruff	1m 53s
Type check our own code (py310-windows-64)	2m 27s
	53m 35s

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