Update CHANGELOG and AUTHORS

Author: ndabas

AUTHORS.rst

@@ -12,3 +12,4 @@ Authors
 * Nicholas Bunn - https://github.com/NicholasBunn
 * Nathan McDougall - https://github.com/nathanjmcdougall
 * Oleksandr Zaiats - https://github.com/z4y4ts
+* Nikhil Dabas - https://github.com/ndabas

CHANGELOG.rst

@@ -9,6 +9,7 @@ latest
   (https://github.com/python-grimp/grimp/issues/308).
 * Officially support freethreaded Python 3.14+.
 * Officially support Python 3.15, including lazy imports.
+* Officially support Windows ARM64 Python 3.11+, including freethreaded 3.14+.
 
 3.15 (2026-07-03)
 -----------------