Fix `deck gateway apply` #3358

Job	Run time
integration (kong:2.8)	2m 29s
integration (kong:3.4)	2m 28s
integration (kong:3.5)	2m 37s
integration (kong:3.6)	2m 29s
integration (kong:3.7)	2m 34s
integration (kong:3.8)	2m 44s
integration (kong:3.9)	2m 28s
integration (kong/kong:master)	2m 29s
	20m 18s

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