Fix version bumping when releasing

[bverbeken]

This PR re-adds the logic (added in https://github.com/seatsio/seatsio-python/pull/127/changes and reverted in #131) to bump the version number in uv.lock

This PR also adds:

• building of a wheel (sdist = source recipe, rebuilt on every machine; wheel = frozen, known-good installable artifact)
• a setuptools config in pyproject.toml that indicates which sources to include, namely everything under /seatsio. This is what was missing and what caused the resulting artifact to not contain the required files.

[Copilot]

Pull request overview

This PR fixes the version bumping process in the release script by re-introducing logic to update the uv.lock file and adds proper setuptools configuration for package building. The changes improve the release process by using the uv version command to handle version updates and ensuring proper package inclusion when building wheels.

• Refactored version bumping to use uv version command which updates both pyproject.toml and uv.lock
• Added validation to ensure pyproject.toml version matches the latest release tag before bumping
• Added setuptools configuration to properly include the seatsio package and its subpackages in built artifacts

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
release.mjs	Refactored version bumping logic to use uv version command for updating both pyproject.toml and uv.lock, and added validation to ensure version consistency before bumping
pyproject.toml	Added setuptools package configuration to explicitly include the seatsio package and its subpackages in the built wheel distribution

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