[`flake8-pyi`] Avoid syntax error from conflict with `PIE790` (`PYI021`) #54488

Job	Run time
python package	1m 26s
Determine changes	14s
cargo fmt	20s
mkdocs	2m 48s
pre-commit	2m 10s
cargo build (release)	0s
cargo test (linux, release)	6m 53s
cargo clippy	1m 55s
test scripts	55s
cargo test (linux)	3m 44s
benchmarks instrumented (ruff)	7m 40s
cargo test (wasm)	3m 11s
cargo test (windows)	7m 22s
cargo shear	25s
check playground	0s
cargo build (msrv)	2m 47s
cargo fuzz build	3m 49s
benchmarks instrumented (ty)	0s
formatter instabilities and black similarity	0s
benchmarks-walltime	-1s
ecosystem	3m 20s
test ruff-lsp	44s
fuzz parser	0s
Fuzz for new ty panics	0s
	49m 42s

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