[Snyk] Security upgrade engine.io-client from 1.8.5 to 5.0.0

[snyk-bot]

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

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • client/package.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	758/1000 Why? Proof of Concept exploit, Recently disclosed, Has a fix available, CVSS 7.3	Access Restriction Bypass SNYK-JS-XMLHTTPREQUESTSSL-1255647	Yes	Proof of Concept

(*) Note that the real score may have changed since the PR was raised.

Commit messages

Package name: engine.io-client

The new version differs by 142 commits.

• 14e8180 chore(release): 5.0.0
• b8e06a8 refactor: use globalObject "self" in webpack configuration
• 6551683 feat: add autoUnref option
• 9bf70c1 docs(changelog): include changelog for release 3.5.1
• c361bc6 feat: listen to the "offline" event
• 6f7c89d chore(release): 4.1.2
• ed48b5d fix: silently close the transport in the beforeunload hook
• 76338d7 refactor: use globalObject "this" in webpack configuration
• ee0a35d chore(release): 4.1.1
• e551fc0 chore: point towards the master branch for the CI badge
• c95fdea fix: remove polyfill for process in the bundle
• 63939e6 chore(release): 4.1.0
• 8ad533f chore: ignore generated file
• d134fee feat: add missing ws options
• 2bd444a chore(release): 4.0.6
• aeaf072 chore: bump ws and debug versions
• acb2216 chore: update GitHub issue templates
• ab8c746 docs(changelog): include changelog for release 3.5.0
• 70b3551 style: fix Russian spelling (JSON-based index names rethinkdb/horizon#650)
• afd25b4 chore(release): 4.0.5
• 5c9726c docs: fix withCredentials default value
• 587ccf3 refactor: remove the policyPort option
• 9146a57 chore: bump dev dependencies
• 20f7fe0 ci: migrate to GitHub Actions

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