chore: Add external contributor to CHANGELOG.md (#16802)

This PR adds the external contributor to the CHANGELOG.md file, so that
they are credited for their contribution. See #16763

Co-authored-by: chargome <20254395+chargome@users.noreply.github.com>
Co-authored-by: Francesco Gringl-Novy <francesco.novy@sentry.io>

Author: 3 people

CHANGELOG.md

@@ -4,7 +4,7 @@
 
 - "You miss 100 percent of the chances you don't take. — Wayne Gretzky" — Michael Scott
 
-Work in this release was contributed by @0xbad0c0d3. Thank you for your contribution!
+Work in this release was contributed by @0xbad0c0d3 and @alSergey. Thank you for your contributions!
 
 ## 9.34.0