Bump to v0.2.4.

[Ubospica]

Summary

• Bump the Python package version to 0.2.4 for the next release.

Test plan

• Build the source distribution.
• Validate package metadata with twine check.

[gemini-code-assist]

Code Review

This pull request updates the version of the xgrammar package from 0.2.3 to 0.2.4 in pyproject.toml. There are no review comments, and I have no feedback to provide.

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[Copilot]

Pull request overview

This PR bumps the xgrammar Python package version in pyproject.toml to 0.2.4 in preparation for the next release.

Changes:

• Update project version from 0.2.3 to 0.2.4 in packaging metadata.

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