build(deps): Bump js-yaml from 3.15.0 to 4.3.1 in /website

Bumps [js-yaml](https://github.com/nodeca/js-yaml) from 3.15.0 to 4.3.1.
- [Changelog](https://github.com/nodeca/js-yaml/blob/4.3.1/CHANGELOG.md)
- [Commits](nodeca/js-yaml@3.15.0...4.3.1)

---
updated-dependencies:
- dependency-name: js-yaml
  dependency-version: 4.3.1
  dependency-type: indirect
...

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

Author: dependabot[bot]

website/yarn.lock

@@ -4188,9 +4188,9 @@ js-tokens@^3.0.2:
   integrity sha1-mGbfOVECEw449/mWvOtlRDIJwls=
 
 js-yaml@^3.13.1, js-yaml@^3.8.1:
-  version "3.15.0"
-  resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-3.15.0.tgz#586e5214eafe3e893756a41e979b50d89d3e4a67"
-  integrity sha512-ttBQIIQPDeLjpPOohtUdXuXUVoA2uIB6fEH9HyJ7234s5mBJ5wTx20njxplLZQgLaOfpmPQA7X2t5AX6tIPbog==
+  version "3.15.1"
+  resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-3.15.1.tgz#24bc95028f361cdaaa84745b06a109c4486773c0"
+  integrity sha512-S99WuO3HlhO3XN41EtYUNl9zzXjoJx7QvmipxsJVxtCBT0YHEFy+iOJhjSvrmV12nYhWpZaM8lPHkJm0yUMbag==
   dependencies:
     argparse "^1.0.7"
     esprima "^4.0.0"