I am uploading a NMU to DELAYED/10 in order to fix this.
The debdiff is included.
diff -Nru festlex-poslex-2.4/debian/changelog
festlex-poslex-2.4/debian/changelog
--- festlex-poslex-2.4/debian/changelog 2024-02-21 12:19:25.000000000 +0000
+++ festlex-poslex-2.4/debian/changelog 2024-02-21 12:15:32.000000000 +0000
@@ -1,3 +1,10 @@
+festlex-poslex (2.4-1.1) unstable; urgency=medium
+
+ * Non-maintainer upload
+ * Convert to source format 3.0 (Closes: #1007447)
+
+ -- Bastian Germann <[email protected]> Wed, 21 Feb 2024 12:15:32 +0000
+
festlex-poslex (2.4-1) unstable; urgency=medium
* New upstream release without new content
diff -Nru festlex-poslex-2.4/debian/source/format
festlex-poslex-2.4/debian/source/format
--- festlex-poslex-2.4/debian/source/format 2024-02-21 12:19:25.000000000
+0000
+++ festlex-poslex-2.4/debian/source/format 2024-02-21 12:15:28.000000000
+0000
@@ -1 +1 @@
-1.0
+3.0 (quilt)
