Update ws in group website to the latest version � (#596)

Summary:
## The dependency [ws](https://github.com/websockets/ws) was updated from `7.1.2` to `7.2.0`.
This version is **not covered** by your **current version range**.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

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**Publisher:** [lpinca](https://www.npmjs.com/~lpinca)
**License:** MIT

[Find out more about this release](https://github.com/websockets/ws).

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<details>
  <summary>FAQ and help</summary>

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Your [Greenkeeper](https://greenkeeper.io) bot 🌴
Pull Request resolved: https://github.com/facebook/flipper/pull/596

Differential Revision: D18032150

Pulled By: passy

fbshipit-source-id: 44f6156cecb879f523dbe93d22f8b65dbe13646a

static/package.json

@@ -21,7 +21,7 @@
     "mkdirp": "^0.5.1",
     "p-map": "^3.0.0",
     "recursive-readdir": "2.2.2",
-    "ws": "7.1.2",
+    "ws": "7.2.0",
     "xdg-basedir": "^4.0.0",
     "yargs": "^14.2.0"
   },

static/yarn.lock

@@ -3686,10 +3686,10 @@ write-file-atomic@^1.2.0:
     imurmurhash "^0.1.4"
     slide "^1.1.5"
 
-ws@7.1.2:
-  version "7.1.2"
-  resolved "https://registry.yarnpkg.com/ws/-/ws-7.1.2.tgz#c672d1629de8bb27a9699eb599be47aeeedd8f73"
-  integrity sha512-gftXq3XI81cJCgkUiAVixA0raD9IVmXqsylCrjRygw4+UOOGzPoxnQ6r/CnVL9i+mDncJo94tSkyrtuuQVBmrg==
+ws@7.2.0:
+  version "7.2.0"
+  resolved "https://registry.yarnpkg.com/ws/-/ws-7.2.0.tgz#422eda8c02a4b5dba7744ba66eebbd84bcef0ec7"
+  integrity sha512-+SqNqFbwTm/0DC18KYzIsMTnEWpLwJsiasW/O17la4iDRRIO9uaHbvKiAS3AHgTiuuWerK/brj4O6MYZkei9xg==
   dependencies:
     async-limiter "^1.0.0"