[Snyk] Security upgrade socket.io from 1.7.4 to 3.0.0

This PR was automatically created by Snyk using the credentials of a real user.

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

![merge advice](https://app.snyk.io/badges/merge-advice/?package_manager=npm&package_name=socket.io&from_version=1.7.4&to_version=3.0.0&pr_id=39ec305c-72e0-4350-a9d1-f7ed18cb4244&visibility=true&has_feature_flag=false) #### Changes included in this PR - Changes to the following files to upgrade the vulnerable dependencies to a fixed version: - cla_socketserver/package.json - cla_socketserver/package-lock.json #### Vulnerabilities that will be fixed ##### With an upgrade: Severity | Priority Score (*) | Issue | Breaking Change | Exploit Maturity :-------------------------:|-------------------------|:-------------------------|:-------------------------|:------------------------- ![critical severity](https://res.cloudinary.com/snyk/image/upload/w_20,h_20/v1561977819/icon/c.png "critical severity") | **776/1000**
**Why?** Recently disclosed, Has a fix available, CVSS 9.8 | Improper Input Validation
[SNYK-JS-SOCKETIOPARSER-3091012](https://snyk.io/vuln/SNYK-JS-SOCKETIOPARSER-3091012) | Yes | No Known Exploit (*) Note that the real score may have changed since the PR was raised.

Commit messages

Package name: socket.io

The new version differs by 154 commits.

1af3267 chore(release): 3.0.0
02951c4 chore(release): 3.0.0-rc4
54bf4a4 feat: emit an Error object upon middleware error
aa7574f feat: serve msgpack bundle
64056d6 docs(examples): update TypeScript example
cacad70 chore(release): 3.0.0-rc3
d16c035 refactor: rename ERROR to CONNECT_ERROR
5c73733 feat: add support for catch-all listeners
129c641 feat: make Socket#join() and Socket#leave() synchronous
0d74f29 refactor(typings): export Socket class
7603da7 feat: remove prod dependency to socket.io-client
a81b9f3 docs(examples): add example with TypeScript
20ea6bd docs(examples): add example with ES modules
0ce5b4c chore(release): 3.0.0-rc2
8a5db7f refactor: remove duplicate _sockets map
2a05042 refactor: add additional typings
91cd255 fix: close clients with no namespace
58b66f8 refactor: hide internal methods and properties
669592d feat: move binary detection back to the parser
2d2a31e chore: publish the wrapper.mjs file
ebb0575 chore(release): 3.0.0-rc1
c0d171f test: use the reconnect event of the Manager
9c7a48d test: use the complete export name
4bd5b23 feat: throw upon reserved event names

See the full diff

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ministryofjustice / cla_frontend

[Snyk] Security upgrade socket.io from 1.7.4 to 3.0.0 #852

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.