Do not use slots for `_TypedDictSpecialForm` #2081

Job	Run time
Lint	6s
Run tests (3.9)	8s
Run tests (3.9.12)	15s
Run tests (3.10)	8s
Run tests (3.10.4)	14s
Run tests (3.11)	5s
Run tests (3.11.0)	13s
Run tests (3.12)	8s
Run tests (3.12.0)	14s
Run tests (3.13)	8s
Run tests (3.13.0)	13s
Run tests (3.14)	17s
Run tests (pypy3.9)	11s
Run tests (pypy3.10)	9s
Create an issue if daily tests failed	0s
	2m 29s

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