Upgrade to eslint 8

[marcustyphoon]

Upgrades eslint and eslint plugins.

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@kulinda, do you know what the correct way to type this is? It does not accept @param {[key: string]: string[]} data.

/**
 * @param {object.<string, string[]>} data - dictionary of arrays of valid values for each key
 * @returns {object.<string, string>[]} - array of every possible dictionary where one value is chosen for each key
 */

  107:1  warning  Use object shorthand or index signatures instead of `Object`, e.g., `{[key: string]: string}`

edit: ignore this I am stupid

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