Cloud Build: Bump `gcb-docker-gcloud` to v20240718-5ef92b5c36. (#12113) #19

Job	Run time
changes	3s
Build	13m 3s
Chart / Lint	37s
lua-lint	7s
test-go	3m 56s
Verify Doc generation	15s
Chart / Test (v1.28.13)	12m 0s
Chart / Test (v1.29.8)	11m 49s
Chart / Test (v1.30.4)	11m 40s
Chart / Test (v1.31.0)	11m 29s
Kubernetes (v1.28.13) / Kubernetes	45m 20s
Kubernetes (v1.29.8) / Kubernetes	44m 55s
Kubernetes (v1.30.4) / Kubernetes	50m 25s
Kubernetes (v1.31.0) / Kubernetes	44m 55s
Kubernetes chroot (v1.28.13) / Kubernetes CHROOT	44m 28s
Kubernetes chroot (v1.29.8) / Kubernetes CHROOT	45m 4s
Kubernetes chroot (v1.30.4) / Kubernetes CHROOT	44m 48s
Kubernetes chroot (v1.31.0) / Kubernetes CHROOT	44m 30s
	7h 9m 24s

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