Bump socket.io, gatsby, gatsby-plugin-canonical-urls, gatsby-plugin-feed, gatsby-plugin-gatsby-cloud, gatsby-plugin-google-gtag, gatsby-plugin-image, gatsby-plugin-manifest, gatsby-plugin-offline, gatsby-plugin-preload-fonts, gatsby-plugin-react-helmet, gatsby-plugin-sharp, gatsby-plugin-sitemap, gatsby-remark-autolink-headers, gatsby-remark-copy-linked-files, gatsby-remark-images, gatsby-remark-prismjs, gatsby-remark-responsive-iframe, gatsby-remark-smartypants, gatsby-source-filesystem, gatsby-transformer-remark and gatsby-transformer-sharp #73