Fill in release date for 4.1.6

CHANGELOG.txt

@@ -382,7 +382,7 @@ Changelog
  * Maintenance: Switch form submission listings to use the same ordering icons as other listings (Thibaud Colas)
 
 
-4.1.6 (xx.xx.2023) - IN DEVELOPMENT
+4.1.6 (25.05.2023)
 ~~~~~~~~~~~~~~~~~~
 
  * Fix: Rectify previous fix for TableBlock becoming uneditable after save (Sage Abdullah)

docs/releases/4.1.6.md

@@ -1,6 +1,6 @@
 # Wagtail 4.1.6 release notes
 
-_Unreleased_
+_May 25, 2023_
 
 ```{contents}
 ---