Upgrade @typescript-eslint packages

[josh08h]

In order to use the latest TS features we need the following packages to be updated on the HoundCI servers:

"@typescript-eslint/eslint-plugin": "^4",
"@typescript-eslint/parser": "^4",

This will allow us to use template literal types without HoundCI erroring with the following:

We will also be able to use other features such as optional chaining too.

Is somebody able to look into this for us?

[dannyrb]

If someone can point me to where this lives in the codebase, I could author an update? I am seeking a similar update that adds support for using @babel/eslint-parser as a parser target for new versions of eslint