Add missing build dependency on dh addon.

Changes-By: lintian-brush
Fixes: lintian: missing-build-dependency-for-dh_-command
See-also: https://lintian.debian.org/tags/missing-build-dependency-for-dh_-command.html

debian/changelog

@@ -1,6 +1,7 @@
 dulwich (0.20.27-1) UNRELEASED; urgency=low
 
   * New upstream release.
+  * Add missing build dependency on dh addon.
 
  -- Jelmer Vernooij <jelmer@debian.org>  Tue, 04 Jan 2022 22:54:09 -0000
 

debian/control

@@ -13,7 +13,8 @@ Build-Depends: debhelper-compat (= 13),
                python3-certifi,
                python3-fastimport,
                python3-gpg,
-               python3-urllib3 (>= 1.24.1)
+               python3-urllib3 (>= 1.24.1),
+               debhelper
 Standards-Version: 4.6.0
 Vcs-Git: https://salsa.debian.org/python-team/packages/dulwich.git
 Vcs-Browser: https://salsa.debian.org/python-team/packages/dulwich