I am uploading a NMU to DELAYED/10 in order to fix this.
Please find the debdiff attached.
diff -Nru xtide-coastline-20020202/debian/changelog
xtide-coastline-20020202/debian/changelog
--- xtide-coastline-20020202/debian/changelog 2023-11-08 22:24:23.000000000
+0100
+++ xtide-coastline-20020202/debian/changelog 2023-11-08 22:20:38.000000000
+0100
@@ -1,3 +1,10 @@
+xtide-coastline (20020202-1.3) unstable; urgency=medium
+
+ * Non-maintainer upload.
+ * Convert to source format 3.0. (Closes: #1007418)
+
+ -- Bastian Germann <b...@debian.org> Wed, 08 Nov 2023 22:20:38 +0100
+
xtide-coastline (20020202-1.2) unstable; urgency=medium
* Non-maintainer upload.
diff -Nru xtide-coastline-20020202/debian/source/format
xtide-coastline-20020202/debian/source/format
--- xtide-coastline-20020202/debian/source/format 1970-01-01
01:00:00.000000000 +0100
+++ xtide-coastline-20020202/debian/source/format 2023-11-08
22:20:30.000000000 +0100
@@ -0,0 +1 @@
+3.0 (quilt)
