Update Cilium to v1.15.4

[hakman]

No description provided.

[hakman]

May need rebase after #16513
/hold

[hakman]

/unhold

[hakman]

/test all

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rifelpet

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[k8s-ci-robot]

@hakman: 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-kops-e2e-cni-cilium-ipv6	dda0164	link	false	/test pull-kops-e2e-cni-cilium-ipv6

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[hakman]

/test pull-kops-e2e-cni-cilium-eni