[flannel] update to v1.18.1 & make it default (#9104)

README.md

@@ -144,7 +144,7 @@ Note: Upstart/SysV init based OS types are not supported.
   - [calico](https://github.com/projectcalico/calico) v3.23.2
   - [canal](https://github.com/projectcalico/canal) (given calico/flannel versions)
   - [cilium](https://github.com/cilium/cilium) v1.11.6
-  - [flannel](https://github.com/flannel-io/flannel) v0.17.0
+  - [flannel](https://github.com/flannel-io/flannel) v0.18.1
   - [kube-ovn](https://github.com/alauda/kube-ovn) v1.9.2
   - [kube-router](https://github.com/cloudnativelabs/kube-router) v1.5.0
   - [multus](https://github.com/intel/multus-cni) v3.8

roles/download/defaults/main.yml

@@ -105,8 +105,8 @@ calico_apiserver_version: "{{ calico_version }}"
 typha_enabled: false
 calico_apiserver_enabled: false
 
-flannel_version: "v0.17.0"
-flannel_cni_version: "v1.0.1"
+flannel_version: "v0.18.1"
+flannel_cni_version: "v1.1.0"
 cni_version: "v1.1.1"
 weave_version: 2.8.1
 pod_infra_version: "3.6"