Update dependency django-bleach to v3

This MR contains the following updates:

Package	Type	Update	Change
django-bleach (changelog)	dependencies	major	^2.0.0 -> ^3.0.0

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Release Notes

marksweb/django-bleach

v3.0.0

Compare Source

============= 19-05-2022

• Bleach dependency is now at >=5,<6 #​55 (Thanks Laityned)
• Deprecate bleach's allowed_styles kwarg
• Added support for bleach's css_sanitizer kwarg
• Add isort and codespell to ci
• Dropped support for python 3.6 and 3.7 as well as django 3.0 and 3.1
• Renamed default branch from master to main. If you have the project locally, you can update using:

git branch -m master main
git fetch origin
git branch -u origin/main main
git remote set-head origin -a

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