release: bump version to 2.3.1

[radoering]

Fixed

• Fix an issue where cached information about each package was always considered outdated (#10699).

Docs

• Document SHELL_VERBOSITY environment variable (#10678).

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Prepare the 2.3.1 release by bumping the project version and updating the changelog links and notes for the new patch release.

File-Level Changes

Change	Details	Files
Add 2.3.1 release notes to the changelog and wire up corresponding comparison and tag links.	Insert a new 2.3.1 section at the top of the changelog describing the fixed cache invalidation issue and the new SHELL_VERBOSITY docs entry. Update the Unreleased comparison link to start from 2.3.1 instead of 2.3.0. Add a 2.3.1 release tag link alongside the existing version tag links at the bottom of the changelog.	CHANGELOG.md
Bump the package version metadata to 2.3.1.	Update the project version field from 2.3.0 to 2.3.1 in the project configuration.	pyproject.toml

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[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.