Update Python dependency to 3.9 #2691

[phillxnet]

Update from Py3.6 to Py3.9 as commonly available in default repos across our Leap 15.4/15.5/TW
'Built on ...' OS targets.

Fixes #2691

[phillxnet]

Raising our Python base version and updating via Poetry enabled the following to have been updated also:

cffi 1.15.1 to 1.16.0
gevent 22.10.2 to 23.9.1
greenlet 2.0.2 to 3.0.0
zope.event 4.6 to 5.0
zope.interface 5.5.2 to 6.1

[Hooverdan96]

@phillxnet quick question, since when has Rockstor been using the two zope libraries above? I cant recall having seen them anywhere.

[phillxnet]

@phillxnet quick question, since when has Rockstor been using the two zope libraries above? I cant recall having seen them anywhere.

@Hooverdan96 yes, these are new secondary dependencies I believe. Just checking from a TW amd64 test rpm build & install as part of this draft PR and it's partner draft in rpmbuild:

rtumbleweed:/opt/rockstor # poetry show --tree
dbus-python 1.2.18 Python bindings for libdbus
distro 1.8.0 Distro - an OS platform information API
django 2.2.28 A high-level Python Web framework that encourages rapid development and clean, pragmatic design.
├── pytz *
└── sqlparse >=0.2.2
django-braces 1.13.0 Reusable, generic mixins for Django
django-oauth-toolkit 1.1.2 OAuth2 Provider for Django
├── django >=1.11
│   ├── pytz * 
│   └── sqlparse >=0.2.2 
├── oauthlib >=2.0.3
└── requests >=2.13.0
    ├── certifi >=2017.4.17 
    ├── charset-normalizer >=2.0.0,<2.1.0 
    ├── idna >=2.5,<4 
    └── urllib3 >=1.21.1,<1.27 
django-pipeline 1.7.0 Pipeline is an asset packaging library for Django.
djangorestframework 3.9.3 Web APIs for Django, made easy.
gevent 23.9.1 Coroutine-based network library
├── cffi >=1.12.2
│   └── pycparser * 
├── greenlet >=2.0.0
├── zope.event *
└── zope.interface *
gevent-websocket 0.10.1 Websocket handler for the gevent pywsgi server, a Python network library
└── gevent *
    ├── cffi >=1.12.2 
    │   └── pycparser * 
    ├── greenlet >=2.0.0 
    ├── zope.event * 
    └── zope.interface * 
gunicorn 19.10.0 WSGI HTTP Server for UNIX
huey 2.3.0 huey, a little task queue
oauthlib 3.1.0 A generic, spec-compliant, thorough implementation of the OAuth request-signing logic
psutil 5.9.4 Cross-platform lib for process and system monitoring in Python.
psycogreen 1.0 psycopg2 integration with coroutine libraries
psycopg2 2.8.6 psycopg2 - Python-PostgreSQL Database Adapter
python-engineio 2.3.2 Engine.IO server
└── six >=1.9.0
python-socketio 1.6.0 Socket.IO server
├── python-engineio >=1.0.0
│   └── six >=1.9.0 
└── six >=1.9.0
pyzmq 19.0.2 Python bindings for 0MQ
requests 2.27.1 Python HTTP for Humans.
├── certifi >=2017.4.17
├── charset-normalizer >=2.0.0,<2.1.0
├── idna >=2.5,<4
└── urllib3 >=1.21.1,<1.27
six 1.16.0 Python 2 and 3 compatibility utilities
supervisor 4.2.4 A system for controlling process state under UNIX
urlobject 2.1.1 A utility class for manipulating URLs.

So it looks like our much newer gevent has pulled them in judging from the above.

[phillxnet]

Linking this PR to the following Tumbleweed aarch64 failure re gevent build:
"Tumbleweed-aarch64 .venv build fails on gevent wheel" #2693

As detailed in that issue, we are to forgo this specific OS/arch target until such time as we can move our Pyhton on just one more sub-version likely post the following pending Milestone:
https://github.com/rockstor/rockstor-core/milestone/24