Bump TerminalGuiVersion to 2.4.8-develop.15 #209

Job	Run time
resolve-version	13s
build-and-test (windows-latest, win-arm64)	2m 55s
build-and-test (windows-latest, win-x64)	3m 31s
build-and-test (macos-latest, osx-arm64)	1m 28s
build-and-test (ubuntu-latest, linux-x64)	1m 38s
pack-and-publish	28s
release-assets	-1s
notify-downstream	4m 37s
notify-failure	0s
	14m 49s

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