Align client-go to rest of K8s dependencies

[dsimansk]

Changes

This PR aligns require directive of go.mod to the rest of Kubernetes dependencies. The actual version has been already used though replace. However, being "required" is making go modules to enforce it during import, e.g. knative-sanbox/kn-plugin-func project.

I haven't noticed any issues with running the standards checks. Please let me know if I missed anything.

https://github.com/knative-sandbox/kn-plugin-func/blob/main/go.mod#L46

Submitter Checklist

These are the criteria that every PR should meet, please check them off as you
review them:

• Includes tests (if functionality changed/added)
• Run the code checkers with make check
• Regenerate the manpages, docs and go formatting with make generated
• Commit messages follow commit message best practices

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Release Notes

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: dsimansk / name: David Simansky (b7ff0a9)

[tekton-robot]

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[vdemeester]

/ok-to-test
/approve

[tekton-robot]

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[pradeepitm12]

/lgtm