remove 4.4.3 Helm chart

ref: https://github.com/kubernetes/ingress-nginx/issues/9569

Signed-off-by: Jintao Zhang <zhangjintao9020@gmail.com>

index.yaml

@@ -1,34 +1,6 @@
 apiVersion: v1
 entries:
   ingress-nginx:
-  - annotations:
-      artifacthub.io/changes: |
-        - "Values: Add missing `controller.metrics.service.labels`. (#9501)"
-        - "HPA: Add `controller.autoscaling.annotations` to `values.yaml`. (#9253)"
-        - "Update Ingress-Nginx version controller-v1.6.1"
-      artifacthub.io/prerelease: "false"
-    apiVersion: v2
-    appVersion: 1.6.1
-    created: "2023-02-01T18:51:48.667882059Z"
-    description: Ingress controller for Kubernetes using NGINX as a reverse proxy
-      and load balancer
-    digest: c6c53c9848b5e58bc37186c7b8ef7c6710569db22af86fff19115a09aa611c6a
-    home: https://github.com/kubernetes/ingress-nginx
-    icon: https://upload.wikimedia.org/wikipedia/commons/thumb/c/c5/Nginx_logo.svg/500px-Nginx_logo.svg.png
-    keywords:
-    - ingress
-    - nginx
-    kubeVersion: '>=1.20.0-0'
-    maintainers:
-    - name: rikatz
-    - name: strongjz
-    - name: tao12345666333
-    name: ingress-nginx
-    sources:
-    - https://github.com/kubernetes/ingress-nginx
-    urls:
-    - https://github.com/kubernetes/ingress-nginx/releases/download/helm-chart-4.4.3/ingress-nginx-4.4.3.tgz
-    version: 4.4.3
   - annotations:
       artifacthub.io/changes: |
         - Adding support for disabling liveness and readiness probes to the Helm chart