ref: Add external contributor to CHANGELOG.md (#12975)

This PR adds the external contributor to the CHANGELOG.md file, so that
they are credited for their contribution. See #12786

---------

Co-authored-by: Lms24 <8420481+Lms24@users.noreply.github.com>
Co-authored-by: Andrei Borza <andrei.borza@sentry.io>

Author: 3 people

CHANGELOG.md

@@ -8,7 +8,7 @@
 
 - "You miss 100 percent of the chances you don't take. — Wayne Gretzky" — Michael Scott
 
-Work in this release was contributed by @jaspreet57. Thank you for your contribution!
+Work in this release was contributed by @jaspreet57 and @arturovt. Thank you for your contribution!
 
 ## 8.18.0