chore(argo-events): Update chart icon to standard image (#2020)

This will make the charts all look nice when you go to https://artifacthub.io/packages/search?repo=argo&sort=relevance&page=1

Signed-off-by: jmeridth <jmeridth@gmail.com>

charts/argo-events/Chart.yaml

@@ -2,9 +2,9 @@ apiVersion: v2
 appVersion: v1.7.6
 description: A Helm chart for Argo Events, the event-driven workflow automation framework
 name: argo-events
-version: 2.3.0
+version: 2.3.1
 home: https://github.com/argoproj/argo-helm
-icon: https://argoproj.github.io/argo-events/assets/logo.png
+icon: https://avatars.githubusercontent.com/u/30269780?s=200&v=4
 keywords:
   - argoproj
   - argo-events
@@ -15,5 +15,5 @@ maintainers:
     url: https://argoproj.github.io/
 annotations:
   artifacthub.io/changes: |
-    - kind: added
-      description: Allow extraObjects to contain string templates
+    - kind: chore
+      description: Update chart icon