Update hermit-abi requirement from 0.3.9 to 0.4.0 #899

Job	Run time
msrv (ubuntu-latest)	47s
clippy	24s
fmt	3s
cross (ubuntu-latest, nightly)	2m 3s
cross (ubuntu-latest, stable)	1m 26s
msrv (windows-latest)	1m 15s
cross (macos-latest, nightly)	1m 16s
cross (macos-latest, stable)	1m 2s
security_audit	11s
test (ubuntu-latest, nightly)	1m 35s
test (ubuntu-latest, beta)	1m 41s
wine	1m 17s
test (ubuntu-latest, stable)	1m 36s
test (windows-latest, nightly)	1m 59s
test (windows-latest, beta)	1m 59s
test (windows-latest, stable)	3m 42s
test (macos-latest, nightly)	1m 6s
test (macos-latest, beta)	1m 18s
test (macos-latest, stable)	1m 3s
test (windows-latest, nightly-x86_64-pc-windows-gnu)	2m 6s
test (windows-latest, nightly-i686-pc-windows-msvc)	2m 10s
test (windows-latest, nightly-i686-pc-windows-gnu)	2m 10s
	32m 9s

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