fix authorship attribution

[clarketm]

This is a solution for: kubernetes/test-infra#16618 where authorship attribution is given to the bot and not the PR author for merge squash commits.

https://help.github.com/en/github/committing-changes-to-your-project/creating-a-commit-with-multiple-authors

[howardjohn]

This is really annoying. I think its a github bug.. look at https://github.com/envoyproxy/envoy/commits/master, thats not even a robot its just Matt pressing "merge" on github and its accredited to him. I sent a ticket to github, not sure if it will change anything

Thank you very much for fixing this, this was bugging me a lot!

[istio-testing]

@clarketm: Updated the config configmap in namespace default at cluster default using the following files:

• key config.yaml using file prow/config.yaml

In response to this:

This is a solution for: kubernetes/test-infra#16618 where authorship attribution is given to the bot and not the PR author for merge squash commits.

https://help.github.com/en/github/committing-changes-to-your-project/creating-a-commit-with-multiple-authors

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