2.9.4

What's Changed

• Update hierarchical variables handling documentation by @Paul-Saves in #741
• Upgrade GPX to egobox 0.31 by @relf in #749
• Bump pypa/cibuildwheel from 3.0.0 to 3.1.3 by @dependabot[bot] in #745
• Bump actions/download-artifact from 4 to 5 by @dependabot[bot] in #746
• Bump actions/checkout from 4 to 5 by @dependabot[bot] in #747
• Support Python 3.13 by @relf in #750

Full Changelog: v2.9.3...v2.9.4