fix parsing platform_release with kernel versions containing multiple + characters

[radoering]

Resolves: python-poetry/poetry#10786

• Added tests for changed code.
• Updated documentation for changed code.

Summary by Sourcery

Adjust version parsing to correctly handle non-Python platform release strings with multiple '+' characters.

Bug Fixes:

• Fix parsing of platform_release values whose build metadata contains multiple '+' characters so they are treated as valid versions.

Tests:

• Extend version parsing tests to cover platform_release strings with multiple '+' characters in the local segment.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adjusts the generic release version regex to accept plus signs in non-Python version build metadata (e.g., kernel strings in platform_release) and extends tests to cover the new behavior while keeping invalid/valid marker constraints behavior intact.

File-Level Changes

Change	Details	Files
Broaden non-Python release version regex to support + in build/local segments (e.g., kernel versions from platform_release).	Update RELEASE_PATTERN character classes to include + in build/local identifier segments. Keep overall regex structure the same so existing parsing semantics are unchanged.	src/poetry/core/constraints/version/patterns.py
Extend marker constraint parsing tests to cover kernel versions with multiple + characters while preserving invalid/valid distinction based on the allow_prereleases flag.	Add a kernel-style constraint with multiple + characters to the parametrized list of invalid marker constraints when invalid versions are not allowed. Add the same kernel-style constraint to the parametrized list of allowed marker constraints when invalid versions are explicitly allowed, asserting the expected Version.local value.	tests/constraints/version/test_parse_constraint.py

Assessment against linked issues

Issue	Objective	Addressed	Explanation
python-poetry/poetry#10786	Update the version parsing logic so that platform_release markers accept kernel version strings whose build component contains multiple + characters (e.g. 6.12.74+deb13+1-amd64), instead of raising ParseConstraintError.	✅
python-poetry/poetry#10786	Add regression tests ensuring that such multi-+ kernel versions are parsed correctly (into a Version with the appropriate local part) when invalid versions are allowed, and rejected when they are not.	✅

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[sourcery-ai]

Hey - I've left some high level feedback:

• The updated RELEASE_PATTERN now allows consecutive + characters with no alphanumeric between them (e.g. 1.0++foo), so consider tightening the character class to only allow + as a separator between non-empty segments (for example using a subpattern like [0-9a-zA-Z-]+(?:\+[0-9a-zA-Z-]+)*).

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The updated `RELEASE_PATTERN` now allows consecutive `+` characters with no alphanumeric between them (e.g. `1.0++foo`), so consider tightening the character class to only allow `+` as a separator between non-empty segments (for example using a subpattern like `[0-9a-zA-Z-]+(?:\+[0-9a-zA-Z-]+)*`).

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