Bump chrono from 0.4.39 to 0.4.40 #8712

Job	Run time
build-linux-musl (nightly)	3m 17s
build-apple-x86 (nightly)	2m 19s
build-linux-musl (stable)	2m 59s
build-apple-x86 (stable)	2m 22s
build-linux-arm (nightly)	18m 25s
build (ubuntu-latest, nightly)	8m 31s
build-apple-x86 (1.70)	1m 46s
build-linux-musl (1.70)	3m 22s
build-linux-arm (stable)	18m 9s
build (ubuntu-latest, stable)	2m 0s
build-linux-arm (1.70)	5m 40s
build (ubuntu-latest, 1.70)	2m 1s
Lints	37s
Changelog Test	7s
build (macos-latest, nightly)	2m 54s
udeps	2m 15s
build (macos-latest, stable)	3m 16s
build (macos-latest, 1.70)	2m 56s
build (windows-latest, nightly)	4m 46s
build (windows-latest, stable)	5m 10s
build (windows-latest, 1.70)	6m 2s
	1h 38m 54s

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