Fix `deck gateway apply` #3353

Job	Run time
integration (kong:2.8)	2m 44s
integration (kong:3.4)	2m 46s
integration (kong:3.5)	2m 44s
integration (kong:3.6)	2m 43s
integration (kong:3.7)	2m 52s
integration (kong:3.8)	2m 48s
integration (kong:3.9)	2m 44s
integration (kong/kong:master)	2m 45s
	22m 6s

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