I have uploaded a NMU to fix this. debdiff attached.
diff -Nru dhcp-helper-1.2/debian/changelog dhcp-helper-1.2/debian/changelog
--- dhcp-helper-1.2/debian/changelog 2021-01-03 21:26:06.000000000 +0100
+++ dhcp-helper-1.2/debian/changelog 2022-11-23 23:52:28.000000000 +0100
@@ -1,20 +1,27 @@
+dhcp-helper (1.2-3.1) unstable; urgency=medium
+
+ * Non-maintainer upload.
+ * Convert to 3.0 source format. (closes: #953596, #1007509)
+
+ -- Bastian Germann <b...@debian.org> Wed, 23 Nov 2022 23:52:28 +0100
+
dhcp-helper (1.2-3) unstable; urgency=low
* Provide build-arch and build-indep targets in rules. (closes: #999149)
-
+
-- Simon Kelley <si...@thekelleys.org.uk> Mon, 3 Jan 2021 20:26:06 +0000
dhcp-helper (1.2-2) unstable; urgency=low
* Move PIFfile to /run in systemd service file. (closes: #962204)
-
+
-- Simon Kelley <si...@thekelleys.org.uk> Fri, 26 Jun 2020 20:26:06 +0000
dhcp-helper (1.2-1) unstable; urgency=low
* New upstream.
* Add systemd unit file.
-
+
-- Simon Kelley <si...@thekelleys.org.uk> Wed, 26 Jun 2015 20:40:36 +0000
dhcp-helper (1.1-3) unstable; urgency=low
@@ -35,7 +42,7 @@
* Use dpkg-buildflags.
* Update conflicts to include isc-dhcp-server and isc-dhcp-relay.
* Bump Standards-version to 3.9.3
-
+
-- Simon Kelley <si...@thekelleys.org.uk> Wed, 26 Jun 2012 20:40:36 +0000
dhcp-helper (1.0-1) unstable; urgency=low
@@ -71,41 +78,31 @@
* New upstream.
* Bumped standards-version (no changes required).
-
+
-- Simon Kelley <si...@thekelleys.org.uk> Thur, 4 May 2006 15:28:33 +0100
dhcp-helper (0.5-1) unstable; urgency=low
* New upstream.
-
+
-- Simon Kelley <si...@thekelleys.org.uk> Fri, 23 Mar 2006 17:58:43 +0100
dhcp-helper (0.4-1) unstable; urgency=low
* New upstream.
* Removed postints bashism.
-
+
-- Simon Kelley <si...@thekelleys.org.uk> Fri, 17 Mar 2006 20:20:20 +0100
-
+
dhcp-helper (0.3-1) unstable; urgency=low
* Bumped release to mark tweaks to packaging in preparation
* for entry into Debian proper. (closes: #320492)
-
+
-- Simon Kelley <si...@thekelleys.org.uk> Sun, 31 Jul 2005 10:15:20 +0100
dhcp-helper (0.2-1) unstable; urgency=low
* Initial version
-
- -- Simon Kelley <si...@thekelleys.org.uk> Mon, 29 Nov 2004 20:27:27 +0000
-
-
-
-
-
-
-
-
-
+ -- Simon Kelley <si...@thekelleys.org.uk> Mon, 29 Nov 2004 20:27:27 +0000
diff -Nru dhcp-helper-1.2/debian/source/format
dhcp-helper-1.2/debian/source/format
--- dhcp-helper-1.2/debian/source/format 2021-01-03 21:26:06.000000000
+0100
+++ dhcp-helper-1.2/debian/source/format 2022-11-23 23:52:28.000000000
+0100
@@ -1 +1 @@
-1.0
+3.0 (quilt)
