Bump cross-spawn, gatsby, gatsby-cli, gatsby-plugin-google-analytics, gatsby-plugin-image, gatsby-plugin-less, gatsby-plugin-manifest, gatsby-plugin-nprogress, gatsby-plugin-react-helmet, gatsby-plugin-sharp, gatsby-plugin-sitemap, gatsby-plugin-typescript, gatsby-remark-autolink-headers, gatsby-remark-copy-linked-files, gatsby-remark-images, gatsby-source-filesystem and gatsby-transformer-sharp in /site#5988