Bump debhelper from old 12 to 13.

Changes-By: lintian-brush
Fixes: lintian: package-uses-old-debhelper-compat-version
See-also: https://lintian.debian.org/tags/package-uses-old-debhelper-compat-version.html

debian/changelog

+dkimpy-milter (1.2.2-3) UNRELEASED; urgency=medium
+
+  * Bump debhelper from old 12 to 13.
+
+ -- Debian Janitor <janitor@jelmer.uk>  Fri, 23 Sep 2022 10:18:23 -0000
+
 dkimpy-milter (1.2.2-2) unstable; urgency=medium
 
   [ Ondřej Nový ]

debian/control

@@ -3,7 +3,7 @@ Section: mail
 Priority: optional
 Maintainer: Scott Kitterman <scott@kitterman.com>
 Uploaders: Debian Python Team <team+python@tracker.debian.org>
-Build-Depends: debhelper-compat (= 12),
+Build-Depends: debhelper-compat (= 13),
                dh-python,
                python3 (>= 3.3),
                python3-authres (>= 1.1),