Fill in release date for 6.4.1

CHANGELOG.txt

@@ -21,7 +21,7 @@ Changelog
  * Maintenance: npm package updates; `downshift`, `focus-trap-react`, `immer`, `redux`, `uuid` (LB (Ben) Johnston)
 
 
-6.4.1 (xx.xx.xxxx) - IN DEVELOPMENT
+6.4.1 (21.02.2025)
 ~~~~~~~~~~~~~~~~~~
 
  * Fix: Prevent error when filtering by locale and searching with Elasticsearch (Sage Abdullah)

docs/releases/6.4.1.md

@@ -1,6 +1,6 @@
 # Wagtail 6.4.1 release notes
 
-_Unreleased_
+_February 21, 2025_
 
 ```{contents}
 ---