Handlebars v5 will target modern browsers,
while older browsers will still receive support
via version 4.x.

This is needed in order to use `globalThis`, see #1894.
It also made it possible to remove some old polyfills and fallbacks.

Prettier v2 has the following breaking changes:
* enforces spaces between `function` and params
* enforces trailing commas by default

See https://github.blog/changelog/2022-03-24-ignore-commits-in-the-blame-view-beta/

Pulled from 4.x branch, see #1894.

The `browserlist`-config was introduced in 6bc73fd.

See https://webpack.js.org/configuration/target/#browserslist.