release: bump version to 2.2.0

[radoering]

Added

• Add support for nesting dependency groups (#837).
• Add support for PEP 735 dependency groups (#823).
• Add support for PEP 639 license clarity (#870).
• Add support for Python 3.14 (#877, #884).

Changed

• Normalize dependency group names (#868).
• Deprecate table values and values that are not valid SPDX expressions for [project.license] (#870).
• Update list of supported licenses (#872).

Fixed

• Fix an issue where explicitly included files that are in .gitignore were not included in the distribution (#874).
• Fix an issue where marker operations could result in invalid markers (#875).

[sourcery-ai]

Reviewer's Guide

This PR upgrades poetry-core to version 2.2.0 by bumping version metadata and enriching the changelog with new features, improvements, and bug fixes.

Entity relationship diagram for new license and dependency group features

erDiagram
    PROJECT ||--|{ DEPENDENCY_GROUP : contains
    PROJECT ||--|{ LICENSE : has
    DEPENDENCY_GROUP ||--|{ DEPENDENCY_GROUP : nests
    LICENSE {
        string spdx_expression
        string clarity
    }
    DEPENDENCY_GROUP {
        string name
        string normalized_name
        string pep_735_type
    }
    PROJECT {
        string name
        string version
    }

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Class diagram for updated Project, License, and DependencyGroup classes

classDiagram
    class Project {
        +name: str
        +version: str
        +license: License
        +dependency_groups: List~DependencyGroup~
    }
    class License {
        +spdx_expression: str
        +clarity: str
    }
    class DependencyGroup {
        +name: str
        +normalized_name: str
        +pep_735_type: str
        +subgroups: List~DependencyGroup~
    }
    Project --> License
    Project --> DependencyGroup
    DependencyGroup --> DependencyGroup

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File-Level Changes

Change	Details	Files
Changelog updated for 2.2.0 release	Added new features for dependency groups, license clarity, and Python 3.14 support Refined dependency group naming and license handling Documented fixes for file inclusion and marker operations	CHANGELOG.md
Project version bumped to 2.2.0	Updated version in pyproject.toml Aligned version in package init.py	pyproject.toml src/poetry/core/__init__.py

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