Update to go-client 0.26.15

[pjonsson]

This removes some dependencies
on older golang.org/x/net which
contain CVE-2022-41723 and
CVE-2023-39325.

[k8s-ci-robot]

Hi @pjonsson. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[rjbez17]

/ok-to-test
/lgtm

[k8s-ci-robot]

New changes are detected. LGTM label has been removed.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: pjonsson
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[pjonsson]

@rjbez17 Sorry, still learning about the go ecosystem. Have run go mod vendor like the error said the last time now (and rebased on top of latest master).