build(deps): bump gatsby-plugin-sitemap in /packages/website

Bumps [gatsby-plugin-sitemap](https://github.com/gatsbyjs/gatsby/tree/HEAD/packages/gatsby-plugin-sitemap) from 5.10.2 to 5.11.1.
- [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@5.11.1/packages/gatsby-plugin-sitemap)

---
updated-dependencies:
- dependency-name: gatsby-plugin-sitemap
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

packages/website/package.json

@@ -21,7 +21,7 @@
     "gatsby-plugin-react-helmet": "5.10.0",
     "gatsby-plugin-robots-txt": "1.7.0",
     "gatsby-plugin-sharp": "4.10.2",
-    "gatsby-plugin-sitemap": "5.10.2",
+    "gatsby-plugin-sitemap": "5.11.1",
     "gatsby-plugin-svgr": "3.0.0-beta.0",
     "gatsby-source-filesystem": "4.10.1",
     "gatsby-transformer-sharp": "4.10.0",

packages/website/yarn.lock

@@ -6387,10 +6387,10 @@ gatsby-plugin-sharp@4.10.2:
     svgo "1.3.2"
     uuid "3.4.0"
 
-gatsby-plugin-sitemap@5.10.2:
-  version "5.10.2"
-  resolved "https://registry.yarnpkg.com/gatsby-plugin-sitemap/-/gatsby-plugin-sitemap-5.10.2.tgz#208149b900b166c42aa88a5f5436f5c6bf6561e9"
-  integrity sha512-X6pVbytl/QfdfGrnXAEKPf5vc38WIbclmHYIfbgjXUYA9yckTxnfuYZqkS2YwCmbcUTHG1ugcmXMeBGVo77IBQ==
+gatsby-plugin-sitemap@5.11.1:
+  version "5.11.1"
+  resolved "https://registry.yarnpkg.com/gatsby-plugin-sitemap/-/gatsby-plugin-sitemap-5.11.1.tgz#863397fe9dd5aab89bda8db09ef9b877c960150e"
+  integrity sha512-tt92KLUDS+eCrqSA5oYieDGjXLyUDXfYKEwLhYKXk7KlMMjporFJWVrc4Ba8WD04bUWVnzc2rqr19/zQI0ZIpQ==
   dependencies:
     "@babel/runtime" "^7.15.4"
     common-tags "^1.8.2"