Update CHANGELOG

Author: cr-xu

CHANGELOG.md

@@ -38,6 +38,7 @@
 - Added imports to the code example in the README (see #188) (@jank324)
 - Refactor definitions of physical constants (see #189) (@hespe)
 - Fix the quadrupole strength units in the quadrupole docstring (see #202) (@ansantam)
+- Allow CI to run also on arm64 macOS and Windows (see #226) (@cr-xu)
 
 ## [v0.6.3](https://github.com/desy-ml/cheetah/releases/tag/v0.6.3) (2024-03-28)