Bump gatsby-image from 2.7.0 to 2.8.0

Bumps [gatsby-image](https://github.com/gatsbyjs/gatsby/tree/HEAD/packages/gatsby-image) from 2.7.0 to 2.8.0.
- [Release notes](https://github.com/gatsbyjs/gatsby/releases)
- [Changelog](https://github.com/gatsbyjs/gatsby/blob/master/packages/gatsby-image/CHANGELOG.md)
- [Commits](https://github.com/gatsbyjs/gatsby/commits/[email protected]/packages/gatsby-image)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

yarn.lock

@@ -8582,9 +8582,9 @@ gatsby-graphiql-explorer@^0.4.15:
     "@babel/runtime" "^7.11.2"
 
 gatsby-image@latest:
-  version "2.7.0"
-  resolved "https://registry.yarnpkg.com/gatsby-image/-/gatsby-image-2.7.0.tgz#852cb0dd6ba971bd5f5e3a3b86d018afcba71d10"
-  integrity sha512-Ae5teH/iPF9n7NKQP62r5kDz6Rhv4YXpEsUdptRsRH6ioeykGtO1NcYjcsHWo24KrM3fd06LKU9LiGJ5pLrQgg==
+  version "2.8.0"
+  resolved "https://registry.yarnpkg.com/gatsby-image/-/gatsby-image-2.8.0.tgz#fd88262e3c046b7de8a3900bc082f65683490829"
+  integrity sha512-yKoOdmO5E97PThF6W8KOr5zeg7nYu3sE44iOupyFKqUvCDRNg9aPBpruCE4Adfc3yxyhFIN70CGV6nAQNOtmvA==
   dependencies:
     "@babel/runtime" "^7.12.5"
     object-fit-images "^3.2.4"