`ruff server` no longer hangs after shutdown #27924

Job	Run time
Determine changes	8s
pre-commit	57s
mkdocs	2m 26s
cargo fmt	17s
python package	1m 22s
cargo clippy	1m 45s
benchmarks	4m 18s
cargo fuzz	4m 39s
cargo build (release)	5m 15s
cargo test (wasm)	1m 22s
cargo test (linux)	3m 4s
cargo test (windows)	7m 20s
cargo udeps	2m 0s
formatter instabilities and black similarity	0s
test scripts	52s
test ruff-lsp	18s
ecosystem	8m 56s
Fuzz the parser	0s
	44m 59s

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