fix: update cilium version to 1.18.6 [release/v0.41.x] (#1475)

# Backport

This will backport the following commits from `main` to
`release/v0.41.x`:
- [fix: update cilium version to 1.18.6
(#1458)](#1458)

<!--- Backport version: 10.2.0 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sorenlouv/backport)

Co-authored-by: kevinantonythomas <kevin.thomas@nutanix.com>

Author: dlipovetsky

charts/cluster-api-runtime-extensions-nutanix/templates/cni/cilium/manifests/cilium-configmap.yaml

@@ -21,7 +21,7 @@ data:
     RepositoryURL: '{{ if .Values.helmRepository.enabled }}oci://helm-repository.{{ .Release.Namespace }}.svc/charts{{ else }}https://aws.github.io/eks-charts{{ end }}'
   cilium: |
     ChartName: cilium
-    ChartVersion: 1.18.2
+    ChartVersion: 1.18.6
     RepositoryURL: '{{ if .Values.helmRepository.enabled }}oci://helm-repository.{{ .Release.Namespace }}.svc/charts{{ else }}https://helm.cilium.io/{{ end }}'
   cluster-autoscaler: |
     ChartName: cluster-autoscaler

charts/cluster-api-runtime-extensions-nutanix/templates/helm-config.yaml

@@ -25,7 +25,7 @@ repositories:
     repoURL: https://helm.cilium.io/
     charts:
       cilium:
-      - 1.18.2
+      - 1.18.6
   cluster-autoscaler:
     repoURL: https://kubernetes.github.io/autoscaler
     charts:

hack/addons/helm-chart-bundler/repos.yaml

@@ -2,7 +2,7 @@
 # SPDX-License-Identifier: Apache-2.0
 
 export CALICO_VERSION := v3.29.6
-export CILIUM_VERSION := 1.18.2
+export CILIUM_VERSION := 1.18.6
 export NODE_FEATURE_DISCOVERY_VERSION := 0.18.1
 export CLUSTER_AUTOSCALER_CHART_VERSION := 9.52.0
 export AWS_EBS_CSI_CHART_VERSION := 2.51.0