Add Go code-generator v0.20.0-beta.2 crypto hash

[bmelbourne]

What this PR does / why we need it:
During Go v1.15.5 testing, code-generator v0.20.0-beta.2 crypto hash is automatically added to Go module dependencies.

Which issue(s) this PR fixes
N/A

Special notes for your reviewer:
Go crypto hashes file go.sum is updated when executing make verify.

[k8s-ci-robot]

Hi @bmelbourne. Thanks for your PR.

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[k8s-ci-robot]

@bmelbourne: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/ok-to-test

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[bmelbourne]

/assign @zetaab

[johngmyers]

/ok-to-test
/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bmelbourne, johngmyers

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