MRG: misc Rust updates to core #5566

Job	Run time
Check	33s
Check if cbindgen runs cleanly for generating the C headers	8m 17s
coverage	9m 49s
Lints (beta)	40s
Lints (stable)	27s
minimum_rust_version	8m 11s
Publish (dry-run)	6m 7s
test (beta)	1m 35s
test (stable)	1m 32s
test (windows)	3m 6s
test (macos)	1m 20s
test_all_features	13m 19s
Run tests under wasm32-wasi	1m 14s
Check if wasm-pack builds a valid package for the sourmash crate	1m 24s
	57m 34s

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