chore(deps): Update Helm release cilium to v1.20.4

platform/cilium/helmrelease.yaml

@@ -28,7 +28,7 @@ spec:
       chart: cilium
       # [parity] Pinned to the exact version the Ansible bootstrap installs
       # (cilium_version in roles/cilium/defaults/main.yml). Renovate bumps both together.
-      version: "1.20.1"
+      version: "1.20.4"
       sourceRef:
         kind: HelmRepository
         name: cilium