Update protobuf pin

[alex1545]

Renovate bot fails to update the protobuf dependency (#356) as it's unable to guess the new strip_prefix value.

[achew22]

FYI, the RenovateBot team has been very receptive to bug reports in the past over this kind of stuff. I filed renovatebot/renovate#3888 for you to track Renovate being able to handle this correctly.

[alex1545]

Thank you very much @achew22 for your immediate interaction regarding this issue.
But I intentionally haven't filed an issue as I'm not sure how this type of scenario can be handled properly. The strip_prefix can actually be anything you want and doesn't need to be 'similar' in any way to the commit reference (commit sha or tag). So I thought that the current approach of guessing that the strip_prefix ends with the commit reference is probably good enough.

[achew22]

The strip_prefix can actually be anything you want and doesn't need to be 'similar' in any way to the commit reference (commit sha or tag). So I thought that the current approach of guessing that the strip_prefix ends with the commit reference is probably good enough.

That's a good bit of clarity. Asking for the strip_prefix to be updated is a github specific thing. In the case of a commit it would be the commit hash and in the case of a tag it would be the tag name.

[k8s-ci-robot]

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This pull-request has been approved by: alex1545, erain, xingao267

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