feat(github-release): update release kubernetes-sigs/external-dns ( v0.20.0 ➔ v0.21.0 )

| datasource      | package                      | from    | to      |
| --------------- | ---------------------------- | ------- | ------- |
| github-releases | kubernetes-sigs/external-dns | v0.20.0 | v0.21.0 |

Author: mortyops[bot]

scripts/bootstrap-apps.sh

@@ -90,7 +90,7 @@ function apply_crds() {
 
     local -r crds=(
         # renovate: datasource=github-releases depName=kubernetes-sigs/external-dns
-        https://raw.githubusercontent.com/kubernetes-sigs/external-dns/refs/tags/v0.20.0/config/crd/standard/dnsendpoints.externaldns.k8s.io.yaml
+        https://raw.githubusercontent.com/kubernetes-sigs/external-dns/refs/tags/v0.21.0/config/crd/standard/dnsendpoints.externaldns.k8s.io.yaml
         # renovate: datasource=github-releases depName=kubernetes-sigs/gateway-api
         https://github.com/kubernetes-sigs/gateway-api/releases/download/v1.5.1/experimental-install.yaml
         # renovate: datasource=github-releases depName=prometheus-operator/prometheus-operator