Django-prometheus

* Add support for Django 5.0 and Python 3.12.

* Fix postgresql provider import, Thanks [wilsonehusin](https://github.com/korfuri/django-prometheus/pull/402)

* Remove support for Python 3.6, Django versions older tha than 3.2
* Fix two latency metrics not using PROMETHEUS_LATENCY_BUCKETS setting, Thanks [AleksaC](https://github.com/korfuri/django-prometheus/pull/343)
* Support new cache backend names in newer Django versions, Thanks [tneuct](https://github.com/korfuri/django-prometheus/pull/329)
* Make export of migrations False by default, Thanks [kaypee90](https://github.com/korfuri/django-prometheus/pull/313)
* Add support for Django 4.1, Python 3.11
* Add support for Django 4.2 and Psycopg 3

* Switch to Github Actions CI, remove travis-ci.
* Add support for Django 3.2 & 4.0 and Python 3.9 & 3.10

* Remove support for older django and python versions
* Add support for Django 3.0 and Django 3.1
* Add support for [PostGIS](https://github.com/korfuri/django-prometheus/pull/221), Thanks [EverWinter23](https://github.com/EverWinter23)

* Added support for newer Django and Python versions
* Added an extensibility that applications to add their own labels to middleware (request/response) metrics
* Allow overriding and setting custom bucket values for request/response latency histogram metric
* Internal improvements:
* use tox
* Use pytest
* use Black
* Automate pre-releases on every commit ot master
* Fix flaky tests.