I am uploading a NMU in order to fix this.
The debdiff is attached.
diff -Nru vonsh-1.0/debian/changelog vonsh-1.0+ds/debian/changelog
--- vonsh-1.0/debian/changelog 2023-10-23 00:25:29.000000000 +0200
+++ vonsh-1.0+ds/debian/changelog 2023-12-03 22:34:55.000000000 +0100
@@ -1,3 +1,13 @@
+vonsh (1.0+ds-0.1) unstable; urgency=medium
+
+ * Non-maintainer upload.
+ * Drop unnecessary version constraints for Build-Dependencies.
+ * debian/copyright: Align license names with Debian requirements.
+ * Add version suffix +ds to make the version greater than bookworm's.
+ (Closes: #1057155)
+
+ -- Bastian Germann <b...@debian.org> Sun, 03 Dec 2023 22:34:55 +0100
+
vonsh (1.0-0.1) unstable; urgency=medium
* Non-maintainer upload.
diff -Nru vonsh-1.0/debian/control vonsh-1.0+ds/debian/control
--- vonsh-1.0/debian/control 2023-10-23 00:25:26.000000000 +0200
+++ vonsh-1.0+ds/debian/control 2023-12-03 22:34:41.000000000 +0100
@@ -2,7 +2,7 @@
Section: games
Priority: optional
Maintainer: Andrzej Urbaniak <au742...@interia.pl>
-Build-Depends: debhelper (>= 12), libsdl2-dev (>=2.0.9), libsdl2-image-dev
(>=2.0.4), libsdl2-mixer-dev (>=2.0.4)
+Build-Depends: debhelper (>= 12), libsdl2-dev, libsdl2-image-dev,
libsdl2-mixer-dev
Standards-Version: 4.3.0
Homepage: https://github.com/aurb/vonsh/
diff -Nru vonsh-1.0/debian/copyright vonsh-1.0+ds/debian/copyright
--- vonsh-1.0/debian/copyright 2019-08-25 10:40:07.000000000 +0200
+++ vonsh-1.0+ds/debian/copyright 2023-12-03 22:34:55.000000000 +0100
@@ -5,7 +5,7 @@
Files: *
Copyright: 2019 Andrzej Urbaniak
-License: MIT
+License: Expat
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
@@ -26,7 +26,7 @@
Files: inc/pcg_basic.h src/pcg_basic.c
Copyright: 2014 Melissa O'Neill <one...@pcg-random.org>
-License: Apache-License-Version-2.0
+License: Apache-2.0
/usr/share/common-licenses/Apache-2.0
Files: usr/share/games/vonsh/board_tiles.png
