release: bump version to 2.1.4

[radoering]

Changed

• Require virtualenv<20.33 to work around an issue where Poetry uses the wrong Python version (#10491).
• Improve the error messages for the validation of the pyproject.toml file (#10471).

Fixed

• Fix an issue where project plugins were installed even though poetry install was called with --no-plugins (#10405).
• Fix an issue where dependency resolution failed for self-referential extras with duplicate dependencies (#10488).

Docs

• Clarify how to include files that were automatically excluded via VCS ignore settings (#10442).
• Clarify the behavior of poetry add if no version constraint is explicitly specified (#10445).

[sourcery-ai]

Reviewer's Guide

Bump project version to 2.1.4 by updating pyproject.toml and extending the CHANGELOG.md with the new release notes and updated comparison links.

File-Level Changes

Change	Details	Files
Update CHANGELOG with release 2.1.4 notes	Add ## [2.1.4] - 2025-08-04 header Insert Changed, Fixed, and Docs entries for the new version Update comparison links: Unreleased and add [2.1.4] tag link	CHANGELOG.md
Bump project version	Change version from "2.1.3" to "2.1.4" in pyproject.toml	pyproject.toml

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[sourcery-ai]

Hey @radoering - I've reviewed your changes and they look great!

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[esafak]

@radoering Please can you separately try reverting #9413 to fix it, so I know if something needs to be done at virtualenv's end?

[radoering]

@esafak I will try - but probably not until the end of the week. (I still have to understand/reproduce the issue on my machine.)

[radoering]

@esafak Using --python seems to work. See #10506. Thus, it looks like there is nothing to do at virtualenv's end.

[github-actions]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.