Install latest version of reformat-gerkin to fix failing tests

[Treenhan]

I had a discussion with @BenTheElder about the best way to upgrade reformat-gherkin version, and we decided to install the correct version in the source repo script (e.g. verify-gherkins.sh), and point the yaml config from test-infra to that script.

[k8s-ci-robot]

Hi @Treenhan. Thanks for your PR.

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[bowei]

/ok-to-test

[bowei]

/lgtm /approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bowei, Treenhan

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