Build

Bump Externals/imgui from `3cdf3f9` to `1820fe5` (#1781) #5288

Job	Run time
Windows Debug x64 (msvc)	3m 22s
FreeBSD Debug x86_64	2m 43s
Ubuntu Debug amd64 (gcc)	2m 43s
FreeBSD Release x86_64	2m 58s
Windows Debug x86 (msvc)	3m 44s
Ubuntu Release amd64 (gcc)	2m 35s
OpenBSD Debug x86_64	5m 13s
Windows Mixed x64 (msvc)	3m 3s
Ubuntu Debug amd64 (clang)	3m 10s
OpenBSD Release x86_64	4m 53s
Windows Mixed x86 (msvc)	3m 6s
Ubuntu Release amd64 (clang)	4m 0s
NetBSD Debug x86_64	4m 55s
Windows Release x64 (msvc)	5m 35s
Ubuntu Debug arm64 (gcc)	3m 0s
NetBSD Release x86_64	4m 0s
Windows Release x86 (msvc)	5m 11s
Ubuntu Release arm64 (gcc)	3m 40s
Windows Release Master Gold x64 (msvc)	4m 22s
Alpine Debug x86_64 (gcc)	3m 27s
Windows Release Master Gold x86 (msvc)	4m 46s
Alpine Release x86_64 (gcc)	3m 44s
Alpine Debug x86 (gcc)	3m 19s
Alpine Release x86 (gcc)	3m 53s
Fedora Debug x86_64 (gcc)	3m 21s
Fedora Release x86_64 (gcc)	3m 58s
macOS 13 Debug x86_64 (clang)	4m 6s
macOS 13 Release x86_64 (clang)	5m 11s
macOS 15 Debug arm64 (clang)	2m 27s
macOS 15 Release arm64 (clang)	2m 29s
	1h 52m 54s

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