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Bump Externals/imgui from `1820fe5` to `8679cfa` #5309

Job	Run time
FreeBSD Debug x86_64	2m 23s
FreeBSD Release x86_64	2m 17s
OpenBSD Debug x86_64	5m 7s
OpenBSD Release x86_64	4m 21s
NetBSD Debug x86_64	3m 28s
NetBSD Release x86_64	3m 42s
Ubuntu Debug amd64 (gcc)	1m 39s
Ubuntu Release amd64 (gcc)	2m 49s
Ubuntu Debug amd64 (clang)	2m 15s
Ubuntu Release amd64 (clang)	1m 56s
Windows Debug x64 (msvc)	3m 7s
Ubuntu Debug arm64 (gcc)	2m 14s
Windows Debug x86 (msvc)	3m 0s
Ubuntu Release arm64 (gcc)	2m 58s
Windows Mixed x64 (msvc)	2m 19s
Alpine Debug x86_64 (gcc)	1m 59s
Windows Mixed x86 (msvc)	3m 2s
Alpine Release x86_64 (gcc)	1m 56s
Windows Release x64 (msvc)	3m 6s
Alpine Debug x86 (gcc)	2m 14s
Windows Release x86 (msvc)	3m 50s
Alpine Release x86 (gcc)	2m 2s
Windows Release Master Gold x64 (msvc)	2m 56s
Fedora Debug x86_64 (gcc)	1m 54s
Windows Release Master Gold x86 (msvc)	2m 12s
Fedora Release x86_64 (gcc)	1m 56s
macOS 13 Debug x86_64 (clang)	2m 29s
macOS 13 Release x86_64 (clang)	3m 21s
macOS 15 Debug arm64 (clang)	1m 20s
macOS 15 Release arm64 (clang)	1m 43s
	1h 19m 35s

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