[Snyk] Upgrade: gatsby, gatsby-plugin-feed, gatsby-plugin-manifest, gatsby-plugin-offline, gatsby-plugin-sharp, gatsby-remark-images, gatsby-transformer-remark, gatsby-transformer-sharp

[Snyk] Upgrade: gatsby, gatsby-plugin-feed, gatsby-plugin-manifest, gatsby-plugin-offline, gatsby-plugin-sharp, gatsby-remark-images, gatsby-transformer-remark, gatsby-transformer-sharp #754