Bump gcr.io/kaniko-project/executor from 1.17.0 to 1.18.0 #2929

Job	Run time
test-docker-build (base)	44s
test-docker-build (base)	44s
e2e (v1.25.11)	16m 24s
e2e (v1.25.11)	43m 18s
integration (v1.25.11)	25m 25s
integration (v1.25.11)	25m 25s
test-docker-build (git)	56s
test-docker-build (git)	56s
e2e (v1.28.0)	50m 17s
e2e (v1.28.0)	50m 17s
integration (v1.28.0)	24m 38s
integration (v1.28.0)	24m 38s
test-docker-build (image-processing)	1m 14s
test-docker-build (image-processing)	1m 14s
test-docker-build (waiter)	52s
test-docker-build (waiter)	52s
unit	4m 27s
unit	4m 27s
	4h 36m 48s

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