Avoid clearing go version in go.work update script

[liggitt]

What type of PR is this?

/kind bug
/kind cleanup

What this PR does / why we need it:

Short-term fix to avoid stomping the go version in the go.work file during update-go-workspace.sh.

Needed to unblock #123750

As a follow-up, I plan to fold this file into update-vendor.sh

NONE

/assign @thockin @dims @cpanato

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[liggitt]

/sig architecture

[liggitt]

/milestone v1.30

[cpanato]

thanks

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 652d6f4bd87aba294e915fe6c5156cadb721f2fe

[dims]

/approve
/lgtm

[thockin]

Should we clarify the header?

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cpanato, dims, liggitt, thockin

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[liggitt]

Should we clarify the header?

The use lines are generated, the "this is a generated file" header will persist for now, and I'll rationalize this / collapse it into the update-vendor.sh script and probably pull our desired go version into an input so we can fully generate it again