Update Helm release cilium to v1.15.7 (#373)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

apps/cilium/base/kustomization.yaml

@@ -7,7 +7,7 @@ commonAnnotations:
 helmCharts:
   - name: cilium
     releaseName: cilium
-    version: 1.15.6
+    version: 1.15.7
     repo: https://helm.cilium.io
     namespace: kube-system
     includeCRDs: true