uwsgi-python: add bullseye's python version to uwsgi config

uwsgi-python/templates/uwsgi.ini.j2

@@ -44,10 +44,12 @@ log-x-forwarded-for =
 {% if app_python_version == 2 %}
 plugin = python27
 {% elif app_python_version == 3 %}
-{% if debian_version == "stretch" %}
+{% if ansible_distribution_release == "stretch" %}
 plugin = python35
-{% elif debian_version == "buster" %}
+{% elif ansible_distribution_release == "buster" %}
 plugin = python37
+{% elif ansible_distribution_release == "bullseye" %}
+plugin = python39
 {% endif %}
 {% endif %}
 {% if app_venv != '' %}