Update dependency flake8-bugbear to v21

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
flake8-bugbear (changelog)	^20.1.4 -> ^21.0.0

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Release Notes

PyCQA/flake8-bugbear

v21.9.2

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• Fix crash on call in except statement in _to_name_str (#​187)
• Update B006: list, dictionary, and set comprehensions are now also disallowed (#​186)

v21.9.1

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• Update B008: Whitelist more immutable function calls (#​173)
• Remove Python Compatibility Warnings (#​182)
• Add B904: check for raise without from in an except clause (#​181)
• Add Python 3.10 tests to ensure we pass (#​183)

v21.4.3

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Verify the element in item_context.args is of type ast.Name for b017

v21.4.2

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• Add another hasattr() check to b017 visit for .func

v21.4.1

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Happy April Fools! This is no joke, it's a real release.

• Add B017: check for gotta-catch-em-all assertRaises(Exception)

Catching them all is bad!

v21.3.2

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• Fix crash on tuple expansion in try/except block (#​161)

v21.3.1

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• Fix grammar in B015 (#​150)
• Make sure float infinity/NaN does not trigger B008 (#​155)
• Handle positional-only args in class methods (#​158)

v20.11.1

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• Support exception aliases properly in B014 (#​129)
• Add B015: Pointless comparison (#​130)
• Remove check for # noqa comments (#​134)
• Ignore exception classes which are not types (#​135)
• Introduce B016 to check for raising a literal. (#​141)
• Exclude types.MappingProxyType() from B008. (#​144)

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