chore: prep v6.3.0

Signed-off-by: Jan Kowalleck <[email protected]>

Author: jkowalleck

HISTORY.md

@@ -4,6 +4,8 @@ All notable changes to this project will be documented in this file.
 
 ## unreleased
 
+## 6.3.0 -- 2023-12-12
+
 * Dependencies
   * Widened optional dependency `libxmljs2@^0.31||^0.32||^0.33`, was `@^0.31||^0.32` (via [#1001])