gcb-docker-gcloud: bump to Go 1.18

[sbueringer]

Signed-off-by: Stefan Büringer [email protected]

[sbueringer]

/assign @dims
(not sure who I should assign)

[dims]

let's give it a shot :)

/approve
/lgtm

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[sbueringer]

@dims Thx, looks good!

 docker run -it --entrypoint /bin/sh gcr.io/k8s-staging-test-infra/gcb-docker-gcloud:v20220609-2e4c91eb7e
/workspace # go version
go version go1.18.3 linux/amd64