update modules, dockerfile and container. fix and change things that …

[tommywienert]

…are handled differently now (mainly discords 'intents' system)

Hey there @jarulsamy, i found your project and realised it wasn't working anymore(as mentioned in #39 ), but it inspired me to do a nodejs Plex-Discord-Bot.
As a thank you, i wanted to fix your bot since you don't have time currently. So here it is. i updated everything to a newer state (i think discord does not allow the old stuff to work anymore ... you need those intents), if you have some time please have a look if this is okay for you.
in detail:
python modules are updated, i tested this on python3.12 but i left in a little check because of asyncio/async_timeout
Dockerfile now uses the python3.12-slim instead of python3.7-slim
and a slightly modified startup sequence.

greetings
Tommy

P.S.: To the users: if you are , like me, not a fan of docker you can also use this locally, you need (inside the Plex-Bot directory):
python3 -m venv env
source env/bin/activate
(env) pip install --upgrade pip setuptools wheel
(env) pip install -r requirements.txt
(env) python -m PlexBot

if you want out ... simply type
(env) deactivate

on linux you can also make a systemd service for it, the most important bit is
ExecStart=/path/to/env/bin/python -m PlexBot

[tommywienert]

Hey @jarulsamy , are you still with us? 🤔