Update imgui #4294

Job	Run time
macOS / Debug / system-clang	5m 18s
macOS / Release / homebrew-clang	9m 30s
macOS / Release / system-clang	6m 19s
macOS / Debug / homebrew-clang	9m 55s
Release / ubuntu-24.04-arm / aarch64 / gcc	20m 39s
Debug / ubuntu-24.04 / x86_64 / gcc	21m 29s
Release / ubuntu-24.04 / x86_64 / clang	22m 10s
Debug / ubuntu-24.04-arm / aarch64 / gcc	1h 1m 0s
Debug / ubuntu-24.04-arm / aarch64 / clang	13m 42s
Release / ubuntu-24.04-arm / aarch64 / clang	55s
Debug / ubuntu-24.04 / x86_64 / clang	18m 51s
Release / ubuntu-24.04 / x86_64 / gcc	29m 47s
Windows / Release / clang	17m 42s
Windows / Debug / cl	18m 31s
Windows / Release / cl	22m 35s
Windows / Release / clang-cl	16m 3s
Windows / Debug / clang-cl	12m 40s
Windows / Debug / clang	14m 30s
	5h 21m 36s

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