chore(deps): update cilium images (patch)

[gardener-ci-robot]

This PR contains the following updates:

Package	Update	Change
quay.io/cilium/certgen	patch	v0.2.2 -> v0.2.3
quay.io/cilium/hubble-ui	patch	v0.13.1 -> v0.13.2
quay.io/cilium/hubble-ui-backend	patch	v0.13.1 -> v0.13.2

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[gardener-prow]

@gardener-ci-robot: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-extension-networking-cilium-e2e-kind	b2342b3	link	true	/test pull-extension-networking-cilium-e2e-kind

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