Add GitHub Security Advisories dashboard (elastic#14427)

Author: clement-fouque

packages/github/changelog.yml

@@ -1,4 +1,9 @@
 # newer versions go on top
+- version: "2.9.0"
+  changes:
+    - description: Add security advisories dashboard.
+      type: enhancement
+      link: https://github.com/elastic/integrations/pull/14427
 - version: "2.8.2"
   changes:
     - description: Fix minor spelling mistakes.