mypy

gh-150886: Remove unused importlib._bootstrap._object_name (#150884) #21731

Job	Run time
Run mypy on Tools/cases_generator	17s
Run mypy on Tools/build	20s
Run mypy on Tools/check-c-api-docs	21s
Run mypy on Tools/jit	21s
Run mypy on Tools/peg_generator	18s
Run mypy on Lib/test/libregrtest	21s
Run mypy on Lib/tomllib	17s
Run mypy on Lib/_pyrepl	20s
Run mypy on Tools/clinic	21s
	2m 56s

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