chore(deps): bump prismjs from 1.20.0 to 1.21.0 in /www

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>

www/yarn.lock

@@ -7881,9 +7881,9 @@ prism-react-renderer@^1.1.0:
   integrity sha512-MgMhSdHuHymNRqD6KM3eGS0PNqgK9q4QF5P0yoQQvpB6jNjeSAi3jcSAz0Sua/t9fa4xDOMar9HJbLa08gl9ug==
 
 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==
+  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"