chore: Add external contributor to CHANGELOG.md (#15156)

This PR adds the external contributor to the CHANGELOG.md file, so that
they are credited for their contribution. See #15148

---------

Co-authored-by: AbhiPrasad <18689448+AbhiPrasad@users.noreply.github.com>
Co-authored-by: Abhijeet Prasad <aprasad@sentry.io>

Author: HazAT

CHANGELOG.md

@@ -10,7 +10,7 @@
 
 - "You miss 100 percent of the chances you don't take. — Wayne Gretzky" — Michael Scott
 
-Work in this release was contributed by @tjhiggins, @GrizliK1988, @davidturissini, @nwalters512, @aloisklink, @arturovt, @benjick, @maximepvrt, @mstrokin, @kunal-511, and @jahands. Thank you for your contributions!
+Work in this release was contributed by @tjhiggins, @GrizliK1988, @davidturissini, @nwalters512, @aloisklink, @arturovt, @benjick, @maximepvrt, @mstrokin, @kunal-511, @jahands, and @nathankleyn. Thank you for your contributions!
 
 ## 9.0.0-alpha.0