chore: Add external contributor to CHANGELOG.md (#15397)

Author: HazAT

CHANGELOG.md

@@ -10,6 +10,8 @@
 
 - "You miss 100 percent of the chances you don't take. — Wayne Gretzky" — Michael Scott
 
+Work in this release was contributed by @filips-alpe. Thank you for your contribution!
+
 ## 9.0.1
 
 - ref(flags): rename unleash integration param ([#15343](https://github.com/getsentry/sentry-javascript/pull/15343))