build(deps): bump Externals/sse2neon from `29716df` to `706d3b5` #4970

Job	Run time
FreeBSD Debug x86_64	6m 51s
Windows Debug x64 (msvc)	35m 13s
FreeBSD Release x86_64	9m 31s
Ubuntu Debug amd64 (gcc)	6m 13s
Windows Debug x86 (msvc)	5m 28s
OpenBSD Debug x86_64	11m 26s
Ubuntu Release amd64 (gcc)	6m 24s
Windows Mixed x64 (msvc)	5m 34s
OpenBSD Release x86_64	9m 20s
Ubuntu Debug amd64 (clang)	6m 38s
Windows Mixed x86 (msvc)	5m 0s
Ubuntu Release amd64 (clang)	10m 8s
NetBSD Debug x86_64	9m 46s
Windows Release x64 (msvc)	10m 6s
Alpine Debug x86_64 (gcc)	6m 47s
NetBSD Release x86_64	8m 48s
Windows Release x86 (msvc)	8m 58s
Alpine Release x86_64 (gcc)	9m 17s
Windows Release Master Gold x64 (msvc)	9m 5s
Alpine Debug x86 (gcc)	7m 25s
Alpine Release x86 (gcc)	9m 27s
Windows Release Master Gold x86 (msvc)	8m 0s
Fedora Debug x86_64 (gcc)	17m 0s
Fedora Release x86_64 (gcc)	15m 33s
macOS Debug x86_64 (clang)	10m 20s
macOS Release x86_64 (clang)	11m 34s
macOS Debug arm64 (clang)	4m 49s
macOS Release arm64 (clang)	5m 13s
	4h 29m 54s

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