Update Helm release cilium to v1.15.12 #630

Job	Run time
linting (lint_jsonnet)	6s
editorconfig	6s
golden (defaults)	24s
linting (lint_yaml)	8s
test (defaults)	20s
test (helm-opensource)	20s
linting (lint_adoc)	9s
golden (helm-opensource)	21s
test (olm-opensource)	20s
golden (olm-opensource)	22s
test (egress-gateway)	22s
golden (egress-gateway)	24s
test (bgp-control-plane)	20s
golden (bgp-control-plane)	23s
test (kubeproxyreplacement-strict)	22s
golden (kubeproxyreplacement-strict)	46s
test (l2-announcement)	20s
golden (l2-announcement)	23s
	5m 56s

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