chore(deps): Update backoff requirement from >=2.0 to >=2.2.1

[dependabot]

Updates the requirements on backoff to permit the latest version.

Release notes

Sourced from backoff's releases.

v2.2.1

[v2.2.1] - 2022-10-05

• Fix type hint for wait generators litl/backoff#177

Changelog

Sourced from backoff's changelog.

[v2.2.1] - 2022-10-05

• Fix type hint for wait generators litl/backoff#177

[v2.2.0] - 2022-10-05

• 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] - 2022-06-08

Fixed

• Don't use importlib.metadata for version litl/backoff#166

[v2.1.1] - 2022-06-08

Fixed

• Fix bug with max_tries/max_time callables litl/backoff#164

[v2.1.0] - 2022-06-07

Changed

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

[v2.0.1] - 2022-04-27

Changed

• Allow None for jitter keyword arg (typing)

[v2.0.0] - 2022-04-26

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

[v1.11.1] - 2021-07-14

Fixed

• Update version in backoff module

[v1.11.0] - 2021-07-12

Added

• Configurable logging levels for backoff and giveup events

Changed

... (truncated)

Commits

• d9d80a9 Prepare v2.2.1 release
• 6cb1a4e Fix type hint for wait generator
• 9a20a7f Merge pull request #159 from edgarrmondragon/docs/backoff-runtime-readme
• d322dc4 Prepare v2.2.0 release
• 3f491ca Merge branch 'fix-typing'
• 77f4209 Refrain from adding Details to backoff namespace
• 31d973f Merge branch 'add-exception-to-details'
• d9b9f01 Improve type hints for runtime, constant wait gens
• e7677e8 Make flake8 happy with line lengths
• 52aef92 Update backoff/_wait_gen.py
• Additional commits viewable in compare view

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