Update pyproject-fmt requirement from <1.6 to <1.7

[dependabot[bot]]

Updates the requirements on pyproject-fmt to permit the latest version.

Release notes

Sourced from pyproject-fmt's releases.

1.6.0

What's Changed

• Support adding the classifier for the current Python prerelease by @​edgarrmondragon in tox-dev/pyproject-fmt#162
• Fix the "Release to PyPI" workflow and add check-jsonschema as a pre-commit hook to prevent future errors by @​edgarrmondragon in tox-dev/pyproject-fmt#167

Full Changelog: https://github.com/tox-dev/pyproject-fmt/compare/1.5.3...1.6.0

Commits

• b835654 Update release.yml
• e347a52 Fix the "Release to PyPI" workflow and add check-jsonschema as a pre-commit h...
• e1ccea9 Support adding the classifier for the current Python prerelease (#162)
• 1fa8cdc [pre-commit.ci] pre-commit autoupdate (#166)
• 3793911 [pre-commit.ci] pre-commit autoupdate (#164)
• 1e818dc [pre-commit.ci] pre-commit autoupdate (#163)
• c28bce9 Bump actions/setup-python from 4 to 5 (#160)
• be5ce17 [pre-commit.ci] pre-commit autoupdate (#159)
• 15ce99b feat: Add poetry-dynamic-versioning build backend (#158)
• c24c4b6 feat: Add deptry tool (#157)
• Additional commits viewable in compare view

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