Update flake8-builtins requirement from <2.1,>=1.5 to >=1.5,<2.2 in /requirements

[dependabot[bot]]

Updates the requirements on flake8-builtins to permit the latest version.

Changelog

Sourced from flake8-builtins's changelog.

2.1.0 (2022-12-23)

• Honor --builtins option from flake8 #73. [gforcada]

2.0.1 (2022-11-01)

• Add official support for python 3.10 and 3.11. [gforcada] [michael-k]

• Update options handling. [gforcada]

• Simplify testing. [gforcada]

2.0.0 (2022-10-08)

• Mark support for python 3.9. [lovetoburnswhen]

• Replace travis for GitHub. [cclauss]

• Fix CI badge. [sobolevn]

• Make black and isort mandatory. [cclauss]

• Drop python 2.7 and 3.6. [gforcada]

• Overhaul GitHub actions to test on actual supported python versions. [gforcada]

• New flake8 option --builtins-ignorelist to specify a list of builtins to ignore. [gsingh93]

1.5.3 (2020-05-14)

• Change messages to have shorter text

1.5.2 (2020-03-16)

• Add DictComp, SetComp, and GeneratorExpr support. [sobolevn]

1.5.1 (2020-03-16)

• Adds kwonly and posonly args support. [sobolevn]

... (truncated)

Commits

• 54c68ee Preparing release 2.1.0
• a7be720 Merge pull request #99 from gforcada/use-flake8-builtins
• e4c87b5 Update CHANGES
• f192d99 feat: take into account --builtins option
• 1fe5f6e Merge pull request #98 from gforcada/drop-mypy
• 795672d chore: drop mypy dependencies
• a7f7f40 chore(ci): drop mypy
• 09354a2 Merge pull request #97 from gforcada/test-workflows
• 238dda5 chore(ci): check ubuntu images on GHA
• cdae7d0 Merge pull request #96 from gforcada/bump-certifi
• Additional commits viewable in compare view

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[Guts]

@dependabot rebase

[dependabot[bot]]

Looks like flake8-builtins is no longer updatable, so this is no longer needed.