Bump memmap2 from 0.8.0 to 0.9.0 #3877

Job	Run time
Check	43s
test (beta)	2m 25s
test_all_features	15m 38s
test (stable)	2m 24s
test (windows)	5m 43s
test (macos)	3m 25s
Check if cbindgen runs cleanly for generating the C headers	2m 16s
coverage	4m 18s
Lints (beta)	50s
minimum_rust_version	6m 32s
Lints (stable)	43s
Publish (dry-run)	53s
Run tests under wasm32-wasi	1m 55s
Check if wasm-pack builds a valid package for the sourmash crate	1m 49s
	49m 34s

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