Add changelog for the budgie changes.

debian/changelog

@@ -1,3 +1,12 @@
+livecd-rootfs (2.848) UNRELEASED; urgency=medium
+
+  * Migrate default Ubuntu Budgie image builds to their new
+    ubuntu-budgie-installer, mirroring what has been done for Ubuntu. At the
+    same time, we add support for building legacy ubiquity-based images as
+    well.
+
+ -- Łukasz 'sil2100' Zemczak <lukasz.zemczak@ubuntu.com>  Wed, 07 Jun 2023 13:33:26 +0200
+
 livecd-rootfs (2.847) mantic; urgency=medium
 
   * canary images: add boot-managed-by-snapd preinstalled by default on the