Use `uv init --lib` in tutorial #39476

Job	Run time
cargo fmt	20s
mkdocs	2m 43s
Determine changes	11s
cargo build (release)	0s
pre-commit	3m 20s
python package	1m 22s
cargo build (msrv)	0s
cargo clippy	0s
benchmarks	0s
cargo fuzz build	0s
cargo shear	0s
cargo test (linux, release)	0s
cargo test (linux)	0s
cargo test (windows)	0s
cargo test (wasm)	0s
formatter instabilities and black similarity	0s
test scripts	0s
test ruff-lsp	0s
ecosystem	0s
fuzz parser	0s
	7m 56s

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