Bump spotipy from 2.20.0 to 2.21.0

[dependabot[bot]]

Bumps spotipy from 2.20.0 to 2.21.0.

Release notes

Sourced from spotipy's releases.

2.21: Flask cache handler

Added

• Added market parameter to album and albums to address #753
• Added 'show_featured_artists.py' to 'examples'.
• Expanded contribution and license sections of the documentation.
• Added FlaskSessionCacheHandler, a cache handler that stores the token info in a flask session.
• Added Python 3.10 in GitHub Actions

Fixed

• Updated the documentation to specify ISO-639-1 language codes.
• Fix AttributeError for text attribute of the Response object
• Require redis v3 if python2.7 (fixes readthedocs)

Changelog

Sourced from spotipy's changelog.

[2.21.0] - 2022-09-26

Added

• Added market parameter to album and albums to address (#753
• Added 'show_featured_artists.py' to 'examples'.
• Expanded contribution and license sections of the documentation.
• Added FlaskSessionCacheHandler, a cache handler that stores the token info in a flask session.
• Added Python 3.10 in GitHub Actions

Fixed

• Updated the documentation to specify ISO-639-1 language codes.
• Fix AttributeError for text attribute of the Response object
• Require redis v3 if python2.7 (fixes readthedocs)

Commits

• 5a7e5c5 Bump to 2.21.0, closes #836
• fd8f97d Add python 3.10 to GitHub Actions (#863)
• 06765c4 Fix flake8
• be27391 Add missing step to CONTRIBUTING.md to activate virtualenv (#848)
• 7fc0880 Add FlaskSessionCacheHandler (#833)
• 7337bf9 Fix readthedocs
• eab3c37 Updated documentation (#826)
• ca73420 Added documentation for windows users attempting to set environment variables...
• 36ea3d9 Fix lint
• 1b0c426 Addition of Test Cases (#818)
• Additional commits viewable in compare view

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