CI : Update to GafferHQ/dependencies 11.0.0a2 #1704

Job	Run time
build (windows-debug-platform25)	22m 20s
build (linux-debug-platform25)	18m 51s
build (linux-platform25)	18m 17s
build (linux-platform24)	19m 4s
build (windows-platform25)	26m 36s
build (macos-arm64-platform25)	12m 28s
	1h 57m 36s

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