Update dependency backoff to v2

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
backoff	==1.11.1 -> ==2.2.1

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Release Notes

litl/backoff (backoff)

v2.2.1

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• Fix type hint for wait generators #​177

v2.2.0

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• Improve type annotation for wait generators from @​hauntsaninja
• Include exception in details dict of call handlers from @​petamas
• Improve type hints for call handlers from @​cdce8p

v2.1.2

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Fixed

• Don't use importlib.metadata for version #​166

v2.1.1

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Fixed

• Fix bug with max_tries/max_time callables #​164

v2.1.0

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Changed

• Get max_tries/max_time values for every call fixes #​160 (from @​jvrsantacruz)

v2.0.1

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Changed

• Allow None for jitter keyword arg (typing)

v2.0.0

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Added

• Add raise_on_giveup keyword arg for decorators
• Add backoff.runtime wait generator for dynamically setting wait times based
  on target function return value or exception details

Changed

• Improve type hints for on_success, on_backoff, on_giveup handlers
• Use decorator-specific detail and handler type hints
• Optionally use typing_extensions for python 3.7 type hinting
• Drop python 3.6 support
• Add python 3.10 support

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