CVE-2023-45288: update golang.org/x/net to 1.23.0

[avrittrohwer]

Ran the following:

go get -u golang.org/x/net@v0.23.0
go mod vendor

[k8s-ci-robot]

Hi @avrittrohwer. 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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[jkh52]

k/k same change for reference: https://github.com/kubernetes/kubernetes/pulls?q=is%3Apr+CVE-2023-45288+is%3Aclosed

We will also need this for branches: release-0.30, release-0.29, release-0.28, and release-0.1.

/ok-to-test
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: avrittrohwer, jkh52

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[jkh52]

Looks like we also want 1.21.9, Makefile still defaults to 1.21.6

[jkh52]

/lgtm