Bump twox-hash from 1.6.3 to 2.0.1 #5883

Job	Run time
Check	35s
coverage	7m 44s
test (beta)	1m 9s
test_all_features	4m 14s
test (stable)	1m 12s
test (windows)	2m 55s
test (macos)	1m 2s
Lints (beta)	34s
Publish (dry-run)	8m 12s
Run tests under wasm32-wasi	1m 16s
Lints (stable)	31s
Check if wasm-pack builds a valid package for the sourmash crate	1m 19s
Check if cbindgen runs cleanly for generating the C headers	8m 37s
minimum_rust_version	1m 36s
	40m 56s

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