I am uploading a NMU to convert this package. debdiff is attached.
diff -Nru gsfonts-other-6.0/debian/changelog gsfonts-other-6.0/debian/changelog
--- gsfonts-other-6.0/debian/changelog 2022-12-10 13:11:14.000000000 +0000
+++ gsfonts-other-6.0/debian/changelog 2022-12-10 13:09:14.000000000 +0000
@@ -1,3 +1,10 @@
+gsfonts-other (6.0-4.1) unstable; urgency=medium
+
+ * Non-maintainer upload.
+ * Convert to 3.0 source format (closes: #1007350).
+
+ -- Bastian Germann <[email protected]> Sat, 10 Dec 2022 13:09:14 +0000
+
gsfonts-other (6.0-4) unstable; urgency=low
[ Christian Perrier ]
diff -Nru gsfonts-other-6.0/debian/source/format
gsfonts-other-6.0/debian/source/format
--- gsfonts-other-6.0/debian/source/format 1970-01-01 00:00:00.000000000
+0000
+++ gsfonts-other-6.0/debian/source/format 2022-12-10 13:09:04.000000000
+0000
@@ -0,0 +1 @@
+3.0 (quilt)
