Fix ParamSpec inference against TypeVarTuple #12714

Job	Run time
Test mypyc suite with 32-bit Python	7m 13s
Test suite with py38-ubuntu, mypyc-compiled	17m 28s
Test suite with py38-windows-64	19m 42s
Test suite with py39-ubuntu	16m 3s
Test suite with py310-ubuntu	15m 25s
Test suite with py311-ubuntu, mypyc-compiled	15m 26s
Test suite with py312-ubuntu, mypyc-compiled	17m 47s
mypyc runtime tests with py39-macos	5m 26s
mypyc runtime tests with py38-debug-build-ubuntu	4m 39s
Type check our own code (py38-ubuntu)	1m 58s
Type check our own code (py38-windows-64)	2m 22s
Formatting and code style with Black + ruff	40s
	2h 4m 9s

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