Update flake8-isort requirement from <4.3,>=4.0 to >=4.0,<5.1 in /requirements

[dependabot[bot]]

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

Changelog

Sourced from flake8-isort's changelog.

5.0.0 (2022-10-08)

• Update dependencies. [gforcada]

• Revamp GitHub actions. [gforcada]

• Drop python 3.6, and add python 3.10. [gforcada]

• Use linters and formatters to keep code sane and beautiful. [gforcada]

4.2.0 (2022-08-04)

• Fix compatibility with flake8 version 5. [nhymxu]

4.1.2.post0 (2022-07-25)

• Release it as a wheel as well. [gforcada]

4.1.2 (2022-07-25)

• The package no longer depends on testfixtures.

4.1.1 (2021-10-14)

• Release py3 only wheels..

4.1.0 (2021-10-14)

• Support flake8 4.x [g-as]

• Switch from travis-ci to github actions. [g-as]

• Drop python 2.7 support and 3.5 as well [g-as]

4.0.0 (2020-08-11)

• Nothing changed yet.

... (truncated)

Commits

• cfc6c49 Preparing release 5.0.0
• 6eb4800 Merge pull request #117 from gforcada/overhaul
• 4114d4a Update CHANGES
• a498f9b cleanup
• c76bae4 cleanup the test file
• 41bf429 chore: run autoformatters (pyupgrade, isort, black)
• 4c57928 chore: rename tests file
• d56f00b fix(ci): fine tune the testing matrix
• 8bfa8b5 feat: overhaul testing
• 1c7dbc5 feat: pin dependencies
• Additional commits viewable in compare view

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[dependabot[bot]]

Superseded by #258.