build: install poetry for DEB builds

Author: alvarolopez

.github/workflows/packaging.yml

@@ -93,7 +93,7 @@ jobs:
         run: cp -r packaging/debian debian
 
       - name: Install Debian deps
-        run: sudo apt-get install -y dpkg-dev debhelper devscripts lintian python3-pip tox dh-python python3-all python3-all-dev python3-pbr pybuild-plugin-pyproject
+        run: sudo apt-get install -y dpkg-dev debhelper devscripts lintian python3-pip tox dh-python python3-all python3-all-dev python3-pbr pybuild-plugin-pyproject python3-poetry
 
       - name: Install dependencies
         run: |