release: bump version to 2.1.2

[radoering]

Changed

• Improve performance of marker operations (#851).

Fixed

• Fix an issue where incorrect markers were calculated when removing parts covered by the project's Python constraint (#841, #846).
• Fix an issue where extra markers were not simplified (#842, #845, #847).
• Fix an issue where the intersection and union of markers was not deterministic (#843).
• Fix an issue where the intersection of python_version markers was not recognized as empty (#849).
• Fix an issue where python_version markers were not simplified (#848, #851).
• Fix an issue where Python constraints on a package were converted into invalid markers (#853).

Summary by Sourcery

Bump version to 2.1.2 with improvements to marker operations and several bug fixes related to Python version and extra markers

Bug Fixes:

• Correct calculation of markers when removing parts covered by Python constraints
• Simplify extra and python_version markers
• Ensure deterministic intersection and union of markers
• Fix conversion of Python constraints to markers

Enhancements:

• Improve performance of marker operations

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request bumps the version to 2.1.2 and includes a new changelog entry documenting the changes. The changes include performance improvements to marker operations and several bug fixes related to Python version and extra markers.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
The version of the package has been bumped to 2.1.2.	Update the version in pyproject.toml. Update the version in src/poetry/core/__init__.py. Add a new entry to CHANGELOG.md for version 2.1.2, detailing changes and fixes.	pyproject.toml src/poetry/core/__init__.py CHANGELOG.md
A new changelog entry was added to document the changes in version 2.1.2.	Add a section for version 2.1.2. List the performance improvements to marker operations. List the fixes for marker calculation, simplification, and determinism issues.	CHANGELOG.md

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[sourcery-ai]

Hey @radoering - I've reviewed your changes - here's some feedback:

Overall Comments:

• The changelog entry includes the date, but this is not automatically updated, so remember to update it when merging.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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