gh-123961: Remove global variable `ModDict` in `_cursesmodule.c` (#12… #161

Job	Run time
Run mypy on Lib/_pyrepl	14s
Run mypy on Lib/test/libregrtest	14s
Run mypy on Tools/build	19s
Run mypy on Tools/cases_generator	18s
Run mypy on Tools/clinic	15s
Run mypy on Tools/jit	15s
Run mypy on Tools/peg_generator	14s
Run mypy on Tools/wasm	13s
	2m 2s

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