Formatter: Improve single-with item formatting for Python 3.8 or older #25541

Job	Run time
pre-commit	42s
cargo fmt	13s
Determine changes	8s
python package	1m 18s
mkdocs	2m 25s
cargo test (linux)	3m 41s
cargo test (windows)	5m 57s
cargo clippy	1m 54s
cargo test (wasm)	1m 19s
cargo fuzz	5m 2s
cargo udeps	1m 46s
formatter instabilities and black similarity	3m 27s
test scripts	50s
benchmarks	4m 33s
test ruff-lsp	14s
ecosystem	5m 50s
	39m 19s

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