Update Helm release cilium to v1.15.12 #594

Job	Run time
editorconfig	7s
linting (lint_jsonnet)	9s
golden (defaults)	17s
golden (helm-opensource)	19s
linting (lint_yaml)	6s
golden (olm-opensource)	21s
test (defaults)	18s
golden (egress-gateway)	19s
linting (lint_adoc)	8s
test (helm-opensource)	18s
golden (bgp-control-plane)	17s
test (olm-opensource)	18s
golden (kubeproxyreplacement-strict)	20s
test (egress-gateway)	20s
golden (l2-announcement)	21s
test (bgp-control-plane)	19s
test (kubeproxyreplacement-strict)	18s
test (l2-announcement)	17s
	4m 52s

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