[changelog] Release v4.9.4

Author: kdeldycke

changelog.md

@@ -1,10 +1,6 @@
 # Changelog
 
-## {gh}`4.9.4 (unreleased) <compare/v4.9.3...main>`
-
-```{{important}}
-This version is not released yet and is under active development.
-```
+## {gh}`4.9.4 (2022-01-04) <compare/v4.9.3...v4.9.4>`
 
 - [mpm] Re-integrate artefacts in GitHub release on tagging.