Update--cluster-version flag

[dinagraves]

/kind documentation

1.16 isn't supported anymore. When I try to run the command it returns:

ERROR: (gcloud.container.clusters.create) ResponseError: code=400, message=Master version "1.16.9-gke.6" is unsupported.

Updated to 1.16.13-gke-1

Changes

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• ✅ Dina Graves Portman (235f69e)

[tekton-robot]

Hi @dinagraves. Thanks for your PR.

I'm waiting for a tektoncd member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[dinagraves]

/assign @dlorenc

[jlpettersson]

Thank you for this!

/ok-to-test

[dinagraves]

Note: updated to use latest instead of specific version. This will make the documentation easier to maintain. I tried running it locally:

gcloud container clusters create foobar --zone=us-central1 --cluster-version=latest

Resulted in a cluster with version 1.16.13-gke.1

[vdemeester]

/lgtm
/cc @sbwsg @dlorenc @bobcatfish @dibyom

[imjasonh]

We should just remove gcloud-specific instructions entirely, like we've done in tektoncd/website#167 -- we can merge this and I'll followup to remove it.

edit: #3174

[imjasonh]

/lgtm
/approve

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