Update uuid in group main to the latest version � (#827)

Summary:
## The dependency [uuid](https://github.com/uuidjs/uuid) was updated from `3.4.0` to `7.0.0`.
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:** [ctavan](https://www.npmjs.com/~ctavan)
**License:** MIT

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

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Your [Greenkeeper](https://greenkeeper.io) bot 🌴
Pull Request resolved: https://github.com/facebook/flipper/pull/827

Reviewed By: jknoxville

Differential Revision: D20067749

Pulled By: passy

fbshipit-source-id: 045c94cc1c28f0854680340f56bb35b854a37c51

package.json

@@ -192,7 +192,7 @@
     "socket.io": "^2.0.4",
     "string-natural-compare": "^3.0.0",
     "tmp": "0.0.33",
-    "uuid": "^3.3.2",
+    "uuid": "^7.0.0",
     "websocket": "^1.0.31",
     "which": "^2.0.1",
     "ws": "^7.2.0",