fix icon based on https://sentry.io/branding/ (current icon url no longer works) (#14140)

Signed-off-by: Asher Foa <asher@asherfoa.com>

stable/sentry/Chart.yaml

@@ -1,7 +1,7 @@
 apiVersion: v1
 description: Sentry is a cross-platform crash reporting and aggregation platform.
 name: sentry
-version: 1.3.7
+version: 1.3.8
 appVersion: 9.0
 keywords:
   - debugging
@@ -9,7 +9,7 @@ keywords:
 sources:
   - https://github.com/getsentry/sentry
 home: https://sentry.io/
-icon: https://sentry.io/_static/getsentry/images/branding/png/sentry-glyph-black.png
+icon: https://sentry-brand.storage.googleapis.com/sentry-glyph-black.png
 maintainers:
   - name: rothgar
     email: justin@linux.com