Bump chrono from 0.4.30 to 0.4.31 #3792

Job	Run time
Check	32s
coverage	4m 4s
Lints (beta)	41s
Lints (stable)	55s
test (beta)	2m 17s
test (stable)	2m 50s
test_all_features	15m 39s
test (windows)	6m 55s
test (macos)	47s
Run tests under wasm32-wasi	1m 51s
Check if wasm-pack builds a valid package for the sourmash crate	2m 22s
Check if cbindgen runs cleanly for generating the C headers	1m 47s
minimum_rust_version	4m 14s
Publish (dry-run)	58s
	45m 52s

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