Bump debhelper from old 9 to 12.

Fixes lintian: package-uses-old-debhelper-compat-version
See https://lintian.debian.org/tags/package-uses-old-debhelper-compat-version.html for more details.

Author: debian-janitor

debian/changelog

@@ -2,6 +2,7 @@ config-package-dev (5.6) UNRELEASED; urgency=medium
 
   * Trim trailing whitespace.
   * Update standards version, no changes needed.
+  * Bump debhelper from old 9 to 12.
 
  -- Debian Janitor <[email protected]>  Sun, 15 Sep 2019 18:14:48 +0000
 

debian/compat

@@ -7,7 +7,7 @@ Homepage: https://debathena.mit.edu/config-package-dev
 Vcs-Git: https://github.com/sipb/config-package-dev
 Vcs-Browser: https://github.com/sipb/config-package-dev
 Rules-Requires-Root: no
-Build-Depends: debhelper (>= 9)
+Build-Depends: debhelper-compat (= 12)
 Standards-Version: 4.1.1
 
 Package: config-package-dev