Update dependency bleach to v4 (develop)

This MR contains the following updates:

Package	Type	Update	Change
bleach	dependencies	major	==3.3.1 -> ==4.1.0

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Release Notes

mozilla/bleach

v4.1.0

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Features

• Python 3.9 support

Bug fixes

• Update sanitizer clean to use vendored 3.6.14 stdlib urllib.parse to fix test failures on Python 3.9 #​536

v4.0.0

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Backwards incompatible changes

• Drop support for unsupported Python versions <3.6 #​520

Security fixes

None

Features

• fix attribute name in the linkify docs (thanks @​CheesyFeet!)

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