v5.6.0-next.0

🚀 Enhancement

• feat: Allow config to set default scale.zero per marktype #8354 (@yhoonkim vega-actions-bot@users.noreply.github.com)

🐛 Bug Fix

• ci: Use Pull Request Head Ref #8363 (@lsh)

Authors: 3

• GitHub Actions Bot (vega-actions-bot@users.noreply.github.com)
• Lukas Hermann (@lsh)
• Younghoon Kim (@yhoonkim)