Bump nvidia/cuda from 12.6.2-base-ubi9 to 12.6.3-base-ubi9 in /validator #776

Job	Run time
helm-lint	5s
validate-csv	32s
validate-helm-values	24s
go-check	1m 54s
unit tests	52s
go-build	1m 40s
build-gpu-operator-validator (ubi9)	11m 21s
build-gpu-operator (ubi9)	16m 49s
e2e-tests-containerd	50m 4s
e2e-tests-nvidiadriver	35m 32s
	1h 59m 13s

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