Update rustls-platform-verifier requirement from 0.3 to 0.4 #553

Job	Run time
Format	14s
Clippy	54s
Check for documentation errors	18s
Build+test (stable, ubuntu-latest)	2m 43s
Build+test (beta, ubuntu-latest)	2m 44s
msrv	55s
Check semver compatibility	58s
Build+test (nightly, ubuntu-latest)	2m 36s
features	1m 35s
Build+test (macos-latest, stable)	2m 33s
Build+test (windows-latest, stable)	6m 8s
	21m 38s

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