chore: update changelog release date

sds100 · sds100 · commit 2a990749d821 · 2026-01-04T20:42:57.000+01:00
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,6 +1,6 @@
 ## [4.0.0 Beta 6](https://github.com/sds100/KeyMapper/releases/tag/v4.0.0-beta.06)
 
-#### TO BE RELEASED
+#### 4 January 2026
 
 ## Added
 
