chore: bump version to 0.4.3

[mnriem]

Automated version bump to 0.4.3.

This PR was created by the Release Trigger workflow. The git tag v0.4.3 has already been pushed and the release artifacts are being built.

Merge this PR to record the version bump and changelog update on main.

[Copilot]

Pull request overview

Automated release PR to record the v0.4.3 version bump on main by updating the project version and adding the corresponding changelog entry.

Changes:

• Bump package version from 0.4.2 to 0.4.3 in pyproject.toml.
• Add a new 0.4.3 section to CHANGELOG.md.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
pyproject.toml	Updates the package version to 0.4.3.
CHANGELOG.md	Adds release notes for 0.4.3.

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