Add changelog entry for recent reverts.

debian/changelog

@@ -1,3 +1,12 @@
+livecd-rootfs (2.842) UNRELEASED; urgency=medium
+
+  * Revert once again the kpartx->losetup changes as those are causing
+    constant build failures for RISC-V images. This clearly needs some more
+    investigation before proceeding. This means that we're back to using
+    kpartx for loop device setup.
+
+ -- Łukasz 'sil2100' Zemczak <lukasz.zemczak@ubuntu.com>  Wed, 24 May 2023 11:07:21 +0200
+
 livecd-rootfs (2.841) mantic; urgency=medium
 
   * The base seed for edubuntu is desktop-gnome, not desktop.  LP: #2019060.