Fill in release date for 6.3.1

CHANGELOG.txt

@@ -51,7 +51,7 @@ Changelog
  * Maintenance: Various performance optimizations to page publishing (Jake Howard)
 
 
-6.3.1 (xx.xx.20xx) - IN DEVELOPMENT
+6.3.1 (19.11.2024)
 ~~~~~~~~~~~~~~~~~~
 
  * Fix: Restore ability to upload profile picture through account settings (Sage Abdullah)

docs/releases/6.3.1.md

@@ -1,6 +1,6 @@
-# Wagtail 6.3.1 release notes - IN DEVELOPMENT
+# Wagtail 6.3.1 release notes
 
-_Unreleased_
+_November 19, 2024_
 
 ```{contents}
 ---