mypy

gh-144377: Clean up sqlite3 Connection's list of weakrefs to Cursor o… #19365

Job	Run time
Run mypy on Tools/check-c-api-docs	19s
Run mypy on Tools/cases_generator	19s
Run mypy on Lib/test/libregrtest	23s
Run mypy on Tools/build	24s
Run mypy on Lib/tomllib	19s
Run mypy on Lib/_pyrepl	23s
Run mypy on Tools/jit	17s
Run mypy on Tools/clinic	19s
Run mypy on Tools/peg_generator	21s
	3m 4s

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