Finalize changelog for 2.06-3pureos1

debian/changelog

+grub2 (2.06-3pureos1) byzantium; urgency=medium
+
+  * Merge with Debian testing, remaining changes:
+    - Show splash screen by default
+    - Enable quick boot
+    - Enable flicker-free boot
+    - Add sbat.pureos.csv.in
+
+ -- Matthias Klumpp <matthias.klumpp@puri.sm>  Mon, 12 Jun 2023 22:12:34 +0200
+
 grub2 (2.06-3) unstable; urgency=medium
 
   [ Colin Watson ]