release: bump version to 1.6.0

[radoering]

Added

• Improve error message for invalid markers (#569).
• Increase robustness when deleting temporary directories on Windows (#460).
• Add support for file dependencies with subdirectories (#467).

Changed

• Replace tomlkit with tomli, which changes the interface of some internal classes (#483).
• Deprecate Package.category (#561).

Fixed

• Fix a performance regression in marker handling (#568).
• Fix an issue where wildcard version constraints were not handled correctly (#402).
• Fix an issue where poetry build created duplicate Python classifiers if they were specified manually (#578).
• Fix an issue where local versions where not handled correctly (#579).

Vendoring

• attrs==23.1.0
• packaging==23.1
• tomli==2.0.1
• typing-extensions==4.5.0

[sonarqubecloud]

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