add custom backport to django for psycopg2 2.9 compatibility (#58934)

And bump django version to 2.2.24.

group_vars/all

@@ -1,6 +1,6 @@
 clean_venv: false
 compile_theme: true
-django_version: 2.2.19
+django_version: 2.2.24
 git_ssh: false
 devinst_share: /usr/local/share/publik-devinst
 publik_conf: "/home/{{user}}/.config/publik"

roles/base/files/utils.py

@@ -0,0 +1,7 @@
+from django.utils.timezone import utc
+
+
+def utc_tzinfo_factory(offset):
+    if offset:
+        raise AssertionError("database connection isn't set to UTC")
+    return utc

roles/base/tasks/main.yml

@@ -57,6 +57,19 @@
     virtualenv: "{{venv_py3}}"
     virtualenv_python: "python3"
 
+- name: guess virtualenv python3 site-packages
+  command: "{{venv_py3_python}} -c 'from distutils.sysconfig import get_python_lib; print(get_python_lib())'"
+  register: venv_py3_site_packages_cmd
+
+- name: Set virtualenv python3 site-packages
+  set_fact:
+    venv_py3_site_packages: "{{ venv_py3_site_packages_cmd.stdout }}"
+
+- name: copy patched django/db/backends/postgresql/utils.py
+  copy:
+    src: utils.py
+    dest: "{{venv_py3_site_packages}}/django/db/backends/postgresql/utils.py"
+
 - name: install django-debug-toolbar
   pip:
     name: "django-debug-toolbar<3"