Merge branch 'lintian-fixes' into 'master'

Fix some issues reported by lintian

See merge request ai3/tools/gitlab-deps!2

debian/compat

-13

debian/control

 Source: gitlab-deps
 Section: net
-Priority: extra
+Priority: optional
 Maintainer: Autistici/Inventati <debian@autistici.org>
-Build-Depends: debhelper (>= 11), dh-python, python3,
+Build-Depends: debhelper-compat (= 13), dh-python, python3,
 Standards-Version: 4.1.3
 
 Package: gitlab-deps

debian/source/format

+3.0 (native)