Update Helm release cilium to v1.15.11 #620

Job	Run time
linting (lint_jsonnet)	7s
test (defaults)	18s
golden (defaults)	22s
linting (lint_yaml)	4s
editorconfig	9s
test (helm-opensource)	19s
golden (helm-opensource)	22s
linting (lint_adoc)	7s
test (olm-opensource)	19s
golden (olm-opensource)	24s
test (egress-gateway)	21s
golden (egress-gateway)	20s
test (bgp-control-plane)	19s
golden (bgp-control-plane)	19s
test (kubeproxyreplacement-strict)	21s
golden (kubeproxyreplacement-strict)	19s
golden (l2-announcement)	21s
test (l2-announcement)	19s
	5m 10s

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