build(deps): bump Externals/sse2neon from `29716df` to `706d3b5` #4969

Job	Run time
Windows Debug x64 (msvc)	35m 12s
Windows Debug x86 (msvc)	6m 1s
Ubuntu Debug amd64 (gcc)	6m 17s
FreeBSD Debug x86_64	6m 46s
Windows Mixed x64 (msvc)	5m 9s
Ubuntu Release amd64 (gcc)	6m 17s
FreeBSD Release x86_64	9m 23s
Windows Mixed x86 (msvc)	4m 38s
Ubuntu Debug amd64 (clang)	6m 55s
OpenBSD Debug x86_64	10m 28s
Windows Release x64 (msvc)	10m 36s
Ubuntu Release amd64 (clang)	9m 45s
OpenBSD Release x86_64	9m 51s
Windows Release x86 (msvc)	8m 43s
Alpine Debug x86_64 (gcc)	7m 11s
NetBSD Debug x86_64	10m 4s
Windows Release Master Gold x64 (msvc)	8m 29s
Alpine Release x86_64 (gcc)	8m 49s
NetBSD Release x86_64	8m 36s
Alpine Debug x86 (gcc)	7m 10s
Windows Release Master Gold x86 (msvc)	8m 23s
Alpine Release x86 (gcc)	9m 56s
Fedora Debug x86_64 (gcc)	17m 19s
Fedora Release x86_64 (gcc)	15m 41s
macOS Debug x86_64 (clang)	7m 57s
macOS Release x86_64 (clang)	10m 15s
macOS Debug arm64 (clang)	5m 16s
macOS Release arm64 (clang)	6m 8s
	4h 27m 15s

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