Added changelog for version 23.04.1.

Author: jlesage

appdefs.yml

@@ -101,6 +101,14 @@ app:
               for more details.
             - Make sure the kernel of your Linux distribution is up-to-date.
   changelog:
+    - version: 23.04.1
+      date: 2023-04-29
+      changes:
+        - 'Fixed WebGL (software) support.'
+        - 'Reverted to using a font with better UTF-8 characters support.'
+        - 'Improved graceful shutdown of Firefox.'
+        - 'Update of the baseimage to version 4.4.0 brings the following changes:'
+        - '2:Updated TigerVNC to version 1.13.1.'
     - version: 23.03.1
       date: 2023-03-05
       changes: