Switch to debhelper-compat 11.

debian/changelog

@@ -7,6 +7,7 @@ python-xstatic-jquery.tablesorter (2.14.5.1-5) unstable; urgency=medium
   [ Thomas Goirand ]
   * Remove useless overrides.
   * Fix d/copyright ordering and years.
+  * Switch to debhelper-compat 11.
 
  -- Thomas Goirand <zigo@debian.org>  Sat, 09 Jan 2021 11:19:46 +0100
 

debian/control

@@ -5,7 +5,7 @@ Maintainer: Debian OpenStack <team+openstack@tracker.debian.org>
 Uploaders:
  Thomas Goirand <zigo@debian.org>,
 Build-Depends:
- debhelper-compat (= 9),
+ debhelper-compat (= 11),
  dh-python,
  openstack-pkg-tools (>= 75~),
  python3-all,