⬆️ Bump gatsby-plugin-manifest from 3.0.0 to 3.1.0 (#12)

Bumps [gatsby-plugin-manifest](https://github.com/gatsbyjs/gatsby/tree/HEAD/packages/gatsby-plugin-manifest) from 3.0.0 to 3.1.0.
- [Release notes](https://github.com/gatsbyjs/gatsby/releases)
- [Changelog](https://github.com/gatsbyjs/gatsby/blob/master/packages/gatsby-plugin-manifest/CHANGELOG.md)
- [Commits](https://github.com/gatsbyjs/gatsby/commits/gatsby-plugin-manifest@3.1.0/packages/gatsby-plugin-manifest)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package-lock.json

@@ -13,7 +13,7 @@
     "gatsby-plugin-google-fonts-with-attributes": "^1.0.7",
     "gatsby-plugin-image": "^1.0.1",
     "gatsby-plugin-intl": "^0.3.3",
-    "gatsby-plugin-manifest": "^3.0.0",
+    "gatsby-plugin-manifest": "^3.1.0",
     "gatsby-plugin-netlify": "^3.0.1",
     "gatsby-plugin-offline": "^4.1.0",
     "gatsby-plugin-react-helmet": "^4.0.0",