k8s-infra: Update Mailing list

Related to:
  - kubernetes/k8s.io#3205

Signed-off-by: Arnaud Meukam <[email protected]>

Author: ameukam

sigs.yaml

@@ -1994,7 +1994,7 @@ sigs:
     recordings_url: http://bit.ly/sig-k8s-infra-playlist
   contact:
     slack: sig-k8s-infra
-    mailing_list: https://groups.google.com/forum/#!forum/kubernetes-sig-k8s-infra
+    mailing_list: https://groups.google.com/a/kubernetes.io/g/sig-k8s-infra
     private_mailing_list: [email protected]
     teams:
     - name: sig-k8s-infra