Bump sharp, gatsby, gatsby-plugin-feed, gatsby-plugin-image, gatsby-plugin-manifest, gatsby-plugin-page-creator, gatsby-plugin-sharp, gatsby-remark-images and gatsby-transformer-sharp

Bump sharp, gatsby, gatsby-plugin-feed, gatsby-plugin-image, gatsby-plugin-manifest, gatsby-plugin-page-creator, gatsby-plugin-sharp, gatsby-remark-images and gatsby-transformer-sharp #2691