Update getrandom requirement from 0.3 to 0.4 #959

Job	Run time
wine	1m 39s
msrv (windows-latest)	36s
msrv (ubuntu-latest)	32s
cross (macos-latest, nightly)	2m 2s
cross (ubuntu-latest, nightly)	2m 34s
clippy / clippy	27s
cross (macos-latest, stable)	1m 41s
fmt / fmt	4s
cross (ubuntu-latest, stable)	1m 49s
security_audit / security_audit	8s
windows_gnu (nightly, x86_64-pc-windows-gnu)	1m 58s
test (windows-latest, beta)	1m 34s
test (ubuntu-latest, stable)	50s
test (windows-latest, nightly)	1m 38s
test (ubuntu-latest, beta)	52s
test (macos-latest, nightly)	1m 10s
test (macos-latest, stable)	56s
test (ubuntu-latest, nightly)	48s
test (windows-latest, stable)	2m 42s
test (macos-latest, beta)	1m 9s
	25m 9s

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