[`flake8-pyi`] Various improvements to PYI034 #26749

Job	Run time
Determine changes	7s
cargo fmt	15s
pre-commit	37s
mkdocs	2m 7s
python package	1m 11s
benchmarks	4m 7s
cargo clippy	1m 47s
cargo fuzz	4m 47s
cargo test (linux)	3m 10s
cargo test (wasm)	1m 10s
cargo test (windows)	8m 0s
formatter instabilities and black similarity	0s
test scripts	55s
cargo udeps	1m 54s
ecosystem	8m 30s
test ruff-lsp	16s
	38m 53s

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