Bump gatsby-plugin-sitemap from 3.0.0 to 3.1.0 in /open-social-fronte…

…nd (#14)

Bumps [gatsby-plugin-sitemap](https://github.com/gatsbyjs/gatsby/tree/HEAD/packages/gatsby-plugin-sitemap) 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-sitemap/CHANGELOG.md)
- [Commits](https://github.com/gatsbyjs/gatsby/commits/gatsby-plugin-sitemap@3.1.0/packages/gatsby-plugin-sitemap)

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

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

open-social-frontend/package.json

@@ -26,7 +26,7 @@
     "gatsby-plugin-react-helmet": "^4.0.0",
     "gatsby-plugin-robots-txt": "^1.5.5",
     "gatsby-plugin-sharp": "^3.0.1",
-    "gatsby-plugin-sitemap": "^3.0.0",
+    "gatsby-plugin-sitemap": "^3.1.0",
     "gatsby-source-apiserver": "^2.1.8",
     "gatsby-source-filesystem": "^3.0.0",
     "gatsby-transformer-sharp": "^3.0.0",