build(deps): bump prismjs from 1.20.0 to 1.21.0 in /website

Bumps [prismjs](https://github.com/PrismJS/prism) from 1.20.0 to 1.21.0.
- [Release notes](https://github.com/PrismJS/prism/releases)
- [Changelog](https://github.com/PrismJS/prism/blob/master/CHANGELOG.md)
- [Commits](PrismJS/prism@v1.20.0...v1.21.0)

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

website/package.json

@@ -25,7 +25,7 @@
     "humanize-string": "^2.1.0",
     "markdownlint-cli": "0.22",
     "pluralize": "^8.0.0",
-    "prismjs": "^1.17.1",
+    "prismjs": "^1.21.0",
     "qs": "^6.9.1",
     "react": "^16.8.4",
     "react-dom": "^16.8.4",

website/yarn.lock

@@ -7470,10 +7470,10 @@ prism-react-renderer@^1.1.0:
   resolved "https://registry.yarnpkg.com/prism-react-renderer/-/prism-react-renderer-1.1.0.tgz#6fe1b33f1de1b23afbdb07663d135f9026eef4ad"
   integrity sha512-WZAw+mBoxk1qZDD1h1WOg0BVHgyk9zqbuIBFNgP+Z71i515jGL0WZIN1FIF8EgOyh06x8Rr7HAUXxsRsoUZKyg==
 
-prismjs@^1.17.1, prismjs@^1.20.0:
-  version "1.20.0"
-  resolved "https://registry.yarnpkg.com/prismjs/-/prismjs-1.20.0.tgz#9b685fc480a3514ee7198eac6a3bf5024319ff03"
-  integrity sha512-AEDjSrVNkynnw6A+B1DsFkd6AVdTnp+/WoUixFRULlCLZVRZlVQMVWio/16jv7G1FscUxQxOQhWwApgbnxr6kQ==
+prismjs@^1.20.0, prismjs@^1.21.0:
+  version "1.21.0"
+  resolved "https://registry.yarnpkg.com/prismjs/-/prismjs-1.21.0.tgz#36c086ec36b45319ec4218ee164c110f9fc015a3"
+  integrity sha512-uGdSIu1nk3kej2iZsLyDoJ7e9bnPzIgY0naW/HdknGj61zScaprVEVGHrPoXqI+M9sP0NDnTK2jpkvmldpuqDw==
   optionalDependencies:
     clipboard "^2.0.0"