docs: Update changelog for 4.3.1 release (#322)

docs/changelog.md

@@ -8,12 +8,23 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
 ### Added
 
-- The `six-spinner` component now supports the BME logo as a spinner option.
-
 ### Removed
 
 ### Changed
 
+## 4.3.1 - 2025-01-09
+
+⚠️ This will be the last release under major version 4. The next release will be version 5. ⚠️
+
+### Added
+
+- The `six-spinner` component now supports the BME logo as a spinner option.
+
+### Deprecated
+
+- The `six` prop on the `six-spinner` component is now deprecated. Use the `logo` prop instead,
+  which allows specifying either **six** or **bme** as its value.
+
 ## 4.3.0 - 2024-12-11
 
 ### Added
@@ -28,8 +39,6 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
 - Most slots, properties and events on the `six-header` component are now deprecated and will be
   removed in one of the next releases.
-- The `six` prop on the `six-spinner` component is now deprecated. Use the `logo` prop instead,
-  which allows specifying either **six** or **bme** as its value.
 
 ### Removed