Bump TerminalGuiVersion to 2.4.12-develop.15 #232

Job	Run time
resolve-version	11s
build-and-test (ubuntu-latest, linux-x64)	1m 43s
build-and-test (windows-latest, win-x64)	3m 23s
build-and-test (windows-latest, win-arm64)	3m 30s
build-and-test (macos-latest, osx-arm64)	1m 49s
pack-and-publish	26s
release-assets	0s
notify-downstream	5m 7s
notify-failure	0s
	16m 9s

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