fix: site build throw error

[afc163]

 ERROR #85901  GRAPHQL

There was an error in your GraphQL query:

Expected node, not `[object Object]`

  17 |         playgroundWillUnmount
  18 |         dependencies
  19 |         htmlCodeTemplate
  20 |       }
  21 |     }
  22 |     pathPrefix
  23 |   }
  24 |   allMarkdownRemark(filter: {fields: {slug: {regex: "//examples//"}}}, sort: {order: ASC, fields: [frontmatter___order]}, limit: 1000) {

原因是 gatsbyjs/gatsby#21188 (comment) ，先锁版本修复。

[netlify]

Deploy preview for gatsby-theme-antv ready!

Built with commit d2d17bb

https://deploy-preview-125--gatsby-theme-antv.netlify.app