[release-1.30] Bump konnectivity-client to v0.30.3

[azimjohn]

What type of PR is this?

/kind feature

What this PR does / why we need it:

apiserver: no real changes to konnectivity-client
konnectivity-server and konnectivity-agent:
use go 1.21 (kubernetes-sigs/apiserver-network-proxy#550)
container images: default to non-root user (kubernetes-sigs/apiserver-network-proxy#564)
see Full delta

Which issue(s) this PR fixes:
kubernetes-sigs/apiserver-network-proxy#615

Special notes for your reviewer: None

Does this PR introduce a user-facing change? None

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.: None

[k8s-ci-robot]

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: azimjohn
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[k8s-ci-robot]

This cherry pick PR is for a release branch and has not yet been approved by Release Managers.
Adding the do-not-merge/cherry-pick-not-approved label.

To merge this cherry pick, it must first be approved (/lgtm + /approve) by the relevant OWNERS.

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[k8s-ci-robot]

PR needs rebase.

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[azimjohn]

wrong branch, will re-open from release-1.30

[cici37]

/triage accepted