doc: firecracker fix in CHANGELOG

Add firecracker SVE related bug fix
to the CHANGELOG.

Signed-off-by: Egor Lazarchuk <[email protected]>

Author: ShadowCurse

CHANGELOG.md

@@ -36,6 +36,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   Now cpu-template-helper will print warnings if it encounters SVE registers
   during the conversion process. This is because cpu templates are limited
   to only modify registers less than 128 bits.
+- [#4413](https://github.com/firecracker-microvm/firecracker/pull/4413):
+  Fixed a bug in the Firecracker that prevented it to restore snapshots of
+  VMs that had SVE enabled.
 
 ## [v1.6.0]