MRG: release sourmash rust core r0.16.0 #5814

Job	Run time
Check	32s
Check if cbindgen runs cleanly for generating the C headers	8m 50s
coverage	10m 29s
Lints (beta)	34s
minimum_rust_version	7m 27s
Lints (stable)	30s
Publish (dry-run)	6m 18s
test (beta)	1m 33s
test_all_features	13m 59s
test (stable)	1m 34s
Run tests under wasm32-wasi	1m 22s
test (windows)	3m 59s
test (macos)	1m 23s
Check if wasm-pack builds a valid package for the sourmash crate	1m 20s
	59m 50s

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