discord.py 2.1.0 upgrade - Phase 1

[JayDwee]

Summary

partial #193 All migration docs have been read and changes have been made as necessary. Tests pass locally

Python 3.7 no longer supported. Python 3.10 cannot be supported due to sqlcipher.

• Currently supported: 3.8, 3.9
• Current server version: 3.9.2

QA Checklist

• Using the bot in Threads.
• Using the bot in Voice Channel chats

Checklist

• [x] This PR fixes an issue.
• [ ] This PR adds something new (e.g. new method or parameters).
• [x] This PR is a breaking change (e.g. methods or parameters removed/renamed)
• [ ] This PR is not a code change (e.g. documentation, README, ...)

• [x] Have you tested the changes? (pytest & dpytest)
• [x] Have you followed PEP-8 for naming and styling?
• [x] Has your code been properly documented with RestructuredText docstrings?
• [x] Have you added your changes to CHANGELOG.md under the [Unreleased] heading?
• [ ] If your code added new bot commands, have you updated documentation.json?

• [x] All of this code is your own, or follows the author repo's licence.

[codecov[bot]]

Codecov Report

Merging #337 (eccb770) into master (8713ece) will increase coverage by 0.20%. The diff coverage is 86.11%.

@@            Coverage Diff             @@
##           master     #337      +/-   ##
==========================================
+ Coverage   86.52%   86.72%   +0.20%     
==========================================
  Files         111      111              
  Lines        8095     8114      +19     
==========================================
+ Hits         7004     7037      +33     
+ Misses       1091     1077      -14     

Flag	Coverage Δ
unittests	86.72% <86.11%> (+0.20%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
koala/cogs/twitch_alert/core.py	10.71% <0.00%> (ø)
koala/cogs/react_for_role/cog.py	49.09% <33.33%> (ø)
koala/cogs/text_filter/cog.py	93.13% <33.33%> (ø)
koala/cogs/twitch_alert/cog.py	61.22% <50.00%> (ø)
koala/cogs/verification/cog.py	70.73% <50.00%> (ø)
tests/tests_utils/last_ctx_cog.py	93.33% <50.00%> (ø)
koala/cogs/intro_cog/cog.py	83.56% <66.66%> (ø)
koala/cogs/voting/cog.py	50.00% <66.66%> (ø)
koalabot.py	75.45% <70.27%> (+10.36%)	:arrow_up:
koala/cogs/colour_role/cog.py	88.10% <75.00%> (-0.05%)	:arrow_down:
... and 24 more

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