[`pyupgrade`] Don't introduce invalid syntax when upgrading old-style… #40225

Job	Run time
Determine changes	13s
cargo fmt	19s
mkdocs	2m 28s
cargo build (release)	5m 35s
pre-commit	3m 13s
python package	1m 22s
cargo clippy	2m 4s
cargo test (linux, release)	4m 2s
cargo build (msrv)	2m 4s
benchmarks	4m 35s
cargo fuzz build	4m 59s
cargo shear	21s
cargo test (linux)	2m 37s
cargo test (wasm)	2m 6s
formatter instabilities and black similarity	3m 27s
cargo test (windows)	6m 36s
test scripts	1m 10s
test ruff-lsp	33s
ecosystem	0s
fuzz parser	0s
	47m 44s

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