WIP: switch docs to using python=3.12 for release testing #6045

Job	Run time
Check	26s
test (beta)	1m 34s
test_all_features	14m 3s
test (stable)	1m 24s
test (windows)	3m 50s
test (macos)	1m 18s
Check if cbindgen runs cleanly for generating the C headers	8m 44s
coverage	10m 21s
Lints (beta)	35s
Lints (stable)	28s
minimum_rust_version	6m 48s
Publish (on tags, dry-run otherwise)	6m 16s
Run tests under wasm32-wasi	1m 17s
Check if wasm-pack builds a valid package for the sourmash crate	1m 26s
	58m 30s

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