chore(changelogs): update changelogs

[gatsbybot]

Updated changelogs of the following packages:

• create-gatsby
• gatsby
• gatsby-cli
• gatsby-plugin-cxs
• gatsby-plugin-feed
• gatsby-plugin-flow
• gatsby-plugin-google-gtag
• gatsby-plugin-google-tagmanager
• gatsby-plugin-image
• gatsby-plugin-manifest
• gatsby-plugin-mdx
• gatsby-plugin-offline
• gatsby-plugin-page-creator
• gatsby-plugin-sass
• gatsby-plugin-sharp
• gatsby-plugin-sitemap
• gatsby-plugin-twitter
• gatsby-plugin-utils
• gatsby-remark-autolink-headers
• gatsby-remark-images
• gatsby-remark-images-contentful
• gatsby-sharp
• gatsby-source-contentful
• gatsby-source-drupal
• gatsby-source-npm-package-search
• gatsby-source-shopify
• gatsby-source-wordpress
• gatsby-transformer-remark
• gatsby-transformer-sharp
• gatsby-transformer-sqip