Update OCI repository URL for k8s-gateway

Author: samip5

template/config/kubernetes/apps/network/k8s-gateway/app/ocirepository.yaml.j2

@@ -10,4 +10,4 @@ spec:
     operation: copy
   ref:
     tag: 3.7.2
-  url: oci://ghcr.io/k8s-gateway/charts/k8s-gateway
+  url: oci://codeberg.org/k8s-gateway/charts/k8s-gateway