Update Dockerfile to add spotipy

[frgaudet]

Title

Adding missing spotipy dependency in Dockerfile

Description

Related Issue

Motivation and Context

Docker build fail with this error message

Using python3.10 (3.10.8)
Creating virtualenv spotdl-1HQUp4N1-py3.10 in /root/.cache/pypoetry/virtualenvs
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3.10/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 883, in exec_module
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "/music/spotdl/__init__.py", line 13, in <module>
    from spotdl.utils.spotify import SpotifyClient
  File "/music/spotdl/utils/spotify.py", line 14, in <module>
    from spotipy import Spotify
ModuleNotFoundError: No module named 'spotipy'

How Has This Been Tested?

Tested on MacOSX 12.6.1

Screenshots (if appropriate)

Types of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project
• [] My change requires a change to the documentation
• I have updated the documentation accordingly
• I have read the CONTRIBUTING document
• I have read the CORE VALUES document
• I have added tests to cover my changes
• All new and existing tests passed

[xnetcat]

This shouldn't be happening, spotipy gets installed with poetry
https://github.com/spotDL/spotify-downloader/blob/master/Dockerfile#L24

What was the command that you ran / Dockerfile?