Bump version to v4.0.6

CHANGELOG.md

@@ -3,6 +3,14 @@ Changelog
 
 All notable changes to this project will be documented in this file.
 
+## [4.0.6] - 2023-07-07
+
+### Fixed
+
+- Fix branding:generate_app_icons failing because of disallowed ICO coder ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/25794))
+- Fix crash in admin interface when viewing a remote user with verified links ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/25796))
+- Fix processing of media files with unusual names ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/25788))
+
 ## [4.0.5] - 2023-07-06
 
 ### Changed

lib/mastodon/version.rb

@@ -13,7 +13,7 @@ module Mastodon
     end
 
     def patch
-      5
+      6
     end
 
     def flags