update operator initContainer and vfioManager images to 12.6.0 #402

Job	Run time
validate-csv	2m 11s
helm-lint	6s
validate-helm-values	32s
go-check	1m 46s
go-build	1m 29s
unit tests	2m 14s
build-gpu-operator-validator (ubi8)	10m 14s
build-gpu-operator (ubi8)	13m 13s
e2e-tests-containerd	48m 34s
e2e-tests-nvidiadriver	36m 56s
	1h 57m 15s

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