Upgrade the `platforms` crate to its latest version, 3.4.1 #354

Job	Run time
Alpine Linux	2m 15s
FreeBSD-x86_64 with rust stable	53s
Linux-x86_64 with rust stable	3m 29s
Linux-x86_64 (rustls-native-roots) with rust stable	3m 27s
Linux-x86_64 (native-tls) with rust stable	3m 10s
Linux-x86_64 (native-tls-vendored) with rust stable	4m 17s
Linux-aarch64 with rust stable	2m 40s
Linux-arm with rust stable	2m 31s
Linux-i686 with rust stable	2m 0s
Linux-powerpc with rust stable	1m 48s
Linux-powerpc64 with rust stable	1m 49s
Linux-powerpc64le with rust stable	2m 24s
Linux-riscv64 with rust stable	2m 30s
Linux-s390x with rust stable	2m 7s
NetBSD-x86_64 with rust stable	1m 59s
Windows-aarch64 with rust stable	4m 31s
Windows-i686 with rust stable	3m 55s
Windows-x86_64 with rust stable	7m 32s
macOS-x86_64 with rust stable	2m 42s
macOS-aarch64 with rust stable	1m 34s
Linux-x86_64 with rust beta	3m 32s
Linux-x86_64 with rust nightly	3m 22s
	1h 4m 27s

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