chore(deps): update babel monorepo to v7.5.4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
@babel/core (source)	devDependencies	patch	7.5.0 -> 7.5.4
@babel/preset-env (source)	devDependencies	patch	7.5.3 -> 7.5.4

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Release Notes

babel/babel

### [`v7.5.4`](https://togithub.com/babel/babel/blob/master/CHANGELOG.md#v754-2019-07-09) [Compare Source](https://togithub.com/babel/babel/compare/v7.5.0...v7.5.4) ##### :bug: Bug Fix - `babel-helpers`, `babel-plugin-proposal-object-rest-spread`, `babel-preset-env` - [#​10188](https://togithub.com/babel/babel/pull/10188) Fix \_objectSpread2 for real ([@​nicolo-ribaudo](https://togithub.com/nicolo-ribaudo))

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