feat(helm): update chart external-dns to 1.15.0

[renovate]

This PR contains the following updates:

Package	Update	Change
external-dns	minor	1.14.5 -> 1.15.0

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[github-actions]

--- kubernetes/apps/network/external-dns/app Kustomization: flux-system/external-dns HelmRelease: network/external-dns

+++ kubernetes/apps/network/external-dns/app Kustomization: flux-system/external-dns HelmRelease: network/external-dns

@@ -13,13 +13,13 @@

     spec:
       chart: external-dns
       sourceRef:
         kind: HelmRepository
         name: external-dns
         namespace: flux-system
-      version: 1.14.5
+      version: 1.15.0
   install:
     remediation:
       retries: 3
   interval: 30m
   maxHistory: 2
   uninstall:

[github-actions]

--- HelmRelease: network/external-dns Deployment: network/external-dns

+++ HelmRelease: network/external-dns Deployment: network/external-dns

@@ -39,13 +39,13 @@

             - ALL
           privileged: false
           readOnlyRootFilesystem: true
           runAsGroup: 65532
           runAsNonRoot: true
           runAsUser: 65532
-        image: registry.k8s.io/external-dns/external-dns:v0.14.2
+        image: registry.k8s.io/external-dns/external-dns:v0.15.0
         imagePullPolicy: IfNotPresent
         env:
         - name: CF_API_TOKEN
           valueFrom:
             secretKeyRef:
               key: api-token