[release-1.6] 🐛 Bump golang.org/x/net to v0.13.0

[chrischdi]

Manual cherry-pick of #2161

Semi-automated via:

function bump() { go mod edit -require golang.org/x/[email protected] && go mod tidy }
bump; git commit -m "Bump golang.org/x/net to v0.13.0"

What this PR does / why we need it:

This bumps golang.org/x/net to v0.13.0 to address vulnerability GO-2023-1988.

We're not affected (according govulncheck) but after some time trivy may report the vulnerability so we bump better now and prior to get to that point.

More info: https://pkg.go.dev/vuln/GO-2023-1988

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

/assign sbueringer

[sbueringer]

/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: a000bd9de635bc7a65010bce2a51e06bde48b198

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer

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