I am uploading a NMU to fix this.
Please find the debdiff attached.
diff -Nru konfont-0.1/debian/changelog konfont-0.1/debian/changelog
--- konfont-0.1/debian/changelog 2023-09-29 11:50:17.000000000 +0200
+++ konfont-0.1/debian/changelog 2023-09-29 11:48:15.000000000 +0200
@@ -1,3 +1,10 @@
+konfont (0.1-8.3) unstable; urgency=medium
+
+ * Non-maintainer upload
+ * Convert to source format 3.0, closes: #1043193
+
+ -- Bastian Germann <b...@debian.org> Fri, 29 Sep 2023 11:48:15 +0200
+
konfont (0.1-8.2) unstable; urgency=medium
* Non-maintainer upload.
diff -Nru konfont-0.1/debian/source/format konfont-0.1/debian/source/format
--- konfont-0.1/debian/source/format 1970-01-01 01:00:00.000000000 +0100
+++ konfont-0.1/debian/source/format 2023-09-29 11:48:15.000000000 +0200
@@ -0,0 +1 @@
+3.0 (quilt)
