Bump version to v0.2.3

[akavi]

What does this PR do?

Bump version to v0.2.3

Docs: https://github.com/cartesia-ai/docs-2025/pull/78

Type of change

• Bug fix
• New feature
• Breaking change
• Documentation
• Other: Version bump

Testing

N/A

Checklist

• I have read the contributing guidelines
• I have added tests that prove my fix is effective or that my feature works
• I have formatted my code with make format

---

Note

Low Risk
Low risk version bump only: updates package metadata and example dependency pins without changing runtime code paths.

Overview
Bumps the SDK package version in pyproject.toml from 0.2.3alpha5 to the stable 0.2.3.

Updates all example and integration pyproject.toml files to pin cartesia-line from 0.2.2 to 0.2.3 so sample projects track the released SDK version.

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