Unpin ingress-controller image version

Updates ingress-controller image to latest instead of previously pinned
0.10.1 version

changelogs/unreleased/28492-upgrade-ingress-to-latest.yml

+---
+title: Unpin ingress image version, default to installing latest
+merge_request: 18047
+author:
+type: added

vendor/ingress/values.yaml

 controller:
   image:
-    tag: "0.10.2"
     repository: "quay.io/kubernetes-ingress-controller/nginx-ingress-controller"
   stats:
     enabled: true