Merge upstream v4.6.0 into libsignal branch #135

Job	Run time
rustfmt	11s
clippy	1m 19s
Cross build from macOS to Linux (x86_64-unknown-linux-gnu)	6m 17s
Cross build from macOS to Linux (FIPS) (x86_64-unknown-linux-gnu)	7m 14s
Test features	6m 31s
Test FIPS integration	2m 52s
Test (stable)	2m 27s
Test (arm-android)	2m 28s
Test (arm64-android)	2m 8s
Test (i686-android)	1m 57s
Test (x86_64-android)	2m 0s
Test (aarch64-ios)	5m 32s
Test (aarch64-ios-sim)	9m 12s
Test (x86_64-ios)	9m 38s
Test (i686-linux)	2m 32s
Test (arm-linux)	2m 24s
Test (aarch64-linux)	2m 25s
Test (arm64-macos)	8m 5s
Test (x86_64-macos)	7m 57s
Test (x86_64-mingw)	5m 30s
Test (i686-msvc)	6m 24s
Test (x86_64-msvc)	6m 17s
	1h 41m 20s

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