[KYUUBI #2979] Fix helm icon url

### _Why are the changes needed?_

Icon url in Helm Chart.yaml is not a real image url.

### _How was this patch tested?_
- [ ] Add some test cases that check the changes thoroughly including negative and positive cases if possible

- [ ] Add screenshots for manual tests if appropriate

- [X] [Run test](https://kyuubi.apache.org/docs/latest/develop_tools/testing.html#running-tests) locally before make a pull request

Closes #2979 from hddong/fix-helm-icon.

Closes #2979

6b0fe04 [hongdongdong] Fix helm icon url

Authored-by: hongdongdong <hongdongdong@cmss.chinamobile.com>
Signed-off-by: hongdongdong <hongdongdong@cmss.chinamobile.com>

Author: hddong

docker/helm/Chart.yaml

@@ -38,9 +38,9 @@ version: 0.1.0
 # incremented each time you make changes to the application. Versions are not expected to
 # follow Semantic Versioning. They should reflect the version the application is using.
 # It is recommended to use it with quotes.
-appVersion: "1.4.0"
+appVersion: "1.5.2"
 
-icon: https://github.com/apache/incubator-kyuubi/blob/master/docs/imgs/kyuubi_logo.png
+icon: https://raw.githubusercontent.com/apache/incubator-kyuubi/master/docs/imgs/kyuubi_logo.png
 
 sources:
   - https://github.com/apache/incubator-kyuubi/tree/master/docker