Update from main packaging tree

debian/changelog

+monado (21.0.0~dfsg1-2~bpo11+1) bullseye-backports; urgency=medium
+
+  * Rebuild for bullseye-backports.
+  * d/control: Update for backport.
+  * d/gbp.conf: Update for backport
+
+ -- Ryan Pavlik <ryan@ryanpavlik.com>  Tue, 26 Oct 2021 17:04:56 -0500
+
 monado (21.0.0~dfsg1-2) unstable; urgency=medium
 
   * d/control

debian/extra/prepare-commit-package.sh

 #!/bin/sh
-# Copyright 2020, Ryan Pavlik <ryan@ryanpavlik.com>
+# Copyright 2020-2021, Ryan Pavlik <ryan@ryanpavlik.com>
 # SPDX-License-Identifier: CC0-1.0
 
 # Packages produced this way are for automated use only and shouldn't be uploaded to the Debian archive.
@@ -22,7 +22,7 @@ set -e
         PKG_REVISION=$2
         export PKG_REVISION
     else
-        PKG_REVISION=1~ci$(date --utc "+%Y%m%d")
+        PKG_REVISION=1~bpo11~ci$(date --utc "+%Y%m%d")
         export PKG_REVISION
     fi