Add support for visionOS #929

Job	Run time
clippy	11s
msrv (ubuntu-latest)	1m 47s
fmt	6s
msrv (windows-latest)	1m 46s
cross (ubuntu-latest, nightly)	2m 24s
security_audit	10s
cross (ubuntu-latest, stable)	1m 16s
wine	1m 43s
cross (macos-latest, nightly)	1m 18s
test (ubuntu-latest, nightly)	1m 35s
cross (macos-latest, stable)	57s
test (ubuntu-latest, beta)	1m 37s
test (ubuntu-latest, stable)	1m 34s
test (windows-latest, nightly)	1m 51s
test (windows-latest, beta)	2m 3s
test (windows-latest, stable)	1m 47s
test (macos-latest, nightly)	1m 4s
test (macos-latest, beta)	1m 4s
test (macos-latest, stable)	1m 7s
test (windows-latest, nightly-x86_64-pc-windows-gnu)	2m 12s
test (windows-latest, nightly-i686-pc-windows-msvc)	2m 13s
test (windows-latest, nightly-i686-pc-windows-gnu)	2m 21s
	32m 6s

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