fix: Remove Symbol usage for older environments

[eps1lon]

Currently some of the syntax used results in transpiled code that assumes ES6 Symbol:
https://unpkg.com/aria-query@3.0.0/lib/elementRoleMap.js (see _slicedToArray)

This is currently an abandoned issue in babel  that is solvable by using @babel/plugin-transform-runtime with the corejs option. This will over transpile most of the features but I assumed that bundle size is of little concern for this package right now. The most popular dependents are generally dev dependencies (eslint-plugin-a11y and @testing-library/dom). Over transpiling should be fixed once babel/babel#10008 is done.

To avoid digging through older documentation I just went ahead and upgrade babel to the latest version (which subsequently required a jest bump).

[jessebeach]

I hadn't considered that this would be used in-browser. I'll need to merge the changes manually. I don't see a reason not to accommodate this case.