Update d/ch for 23.10.43 release

debian/changelog

@@ -1,9 +1,9 @@
-livecd-rootfs (23.10.43) UNRELEASED; urgency=medium
+livecd-rootfs (23.10.43) mantic; urgency=medium
 
   * The unminimize script should install the lxd snap from the per-release
     channel, the same as in the full image. (LP: #2036725)
 
- -- Steve Langasek <steve.langasek@ubuntu.com>  Fri, 22 Sep 2023 02:12:32 -0700
+ -- Utkarsh Gupta <utkarsh@ubuntu.com>  Fri, 22 Sep 2023 15:01:43 +0530
 
 livecd-rootfs (23.10.42) mantic; urgency=medium