Bump immutable from 4.0.0 to 4.3.8 in /website

Bumps [immutable](https://github.com/immutable-js/immutable-js) from 4.0.0 to 4.3.8.
- [Release notes](https://github.com/immutable-js/immutable-js/releases)
- [Changelog](https://github.com/immutable-js/immutable-js/blob/main/CHANGELOG.md)
- [Commits](immutable-js/immutable-js@v4.0.0...v4.3.8)

---
updated-dependencies:
- dependency-name: immutable
  dependency-version: 4.3.8
  dependency-type: indirect
...

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

Author: dependabot[bot]

website/yarn.lock

@@ -2836,9 +2836,9 @@ icss-utils@^5.0.0, icss-utils@^5.1.0:
   integrity sha512-soFhflCVWLfRNOPU3iv5Z9VUdT44xFRbzjLsEzSr5AQmgqPMTHdU3PMT1Cf1ssx8fLNJDA1juftYl+PUcv3MqA==
 
 "immutable@^3.8.1 || ^4.0.0":
-  version "4.0.0"
-  resolved "https://registry.yarnpkg.com/immutable/-/immutable-4.0.0.tgz#b86f78de6adef3608395efb269a91462797e2c23"
-  integrity sha512-zIE9hX70qew5qTUjSS7wi1iwj/l7+m54KWU247nhM3v806UdGj1yDndXj+IOYxxtW9zyLI+xqFNZjTuDaLUqFw==
+  version "4.3.8"
+  resolved "https://registry.yarnpkg.com/immutable/-/immutable-4.3.8.tgz#02d183c7727fb2bb1d5d0380da0d779dce9296a7"
+  integrity sha512-d/Ld9aLbKpNwyl0KiM2CT1WYvkitQ1TSvmRtkcV8FKStiDoA7Slzgjmb/1G2yhKM1p0XeNOieaTbFZmU1d3Xuw==
 
 import-fresh@^3.3.0:
   version "3.3.1"