ref: Add external contributor to CHANGELOG.md (#13336)

This PR adds the external contributor to the CHANGELOG.md file, so that
they are credited for their contribution. See #13209

---

Co-authored-by: Lukas Stracke <[email protected]>

Author: github-actions[bot]

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 @MonstraG and @Zen-cronic. Thank you for your contributions!
+Work in this release was contributed by @MonstraG, @undead-voron and @Zen-cronic. Thank you for your contributions!
 
 ## 8.25.0