v0.12.9

🐛 fix

• @visactor/vgrammar-core: fix calculateNodeValue() in vgrammar-hierrachy to support string value, fix #433
• @visactor/vgrammar-core: upgrade vrender from 0.18.8 to 0.18.13

What's Changed

• Fix/hierarchy string value by @xile611 in #435
• Fix/select interactions by @xile611 in #434
• fix: upgrade vrender from 0.18.8 to 0.18.13 by @xile611 in #437

Full Changelog: v0.12.8...v0.12.9