Update dependency @babel/preset-env to v7.7.6

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
@babel/preset-env (source)	devDependencies	patch	7.7.5 -> 7.7.6

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Release Notes

babel/babel

### [`v7.7.6`](https://togithub.com/babel/babel/blob/master/CHANGELOG.md#v776-2019-12-08) [Compare Source](https://togithub.com/babel/babel/compare/v7.7.5...v7.7.6) ##### :house: Internal - [#​10836](https://togithub.com/babel/babel/pull/10836) chore: add PR Revert labels to changelog [ci-skip]([@​JLHwung](https://togithub.com/JLHwung)) ##### :leftwards_arrow_with_hook: Revert - `babel-plugin-transform-modules-commonjs`, `babel-plugin-transform-regenerator`, `babel-plugin-transform-runtime`, `babel-preset-env`, `babel-runtime-corejs2` - [#​10835](https://togithub.com/babel/babel/pull/10835) Revert "Add ".js" extension to injected polyfill imports" ([@​JLHwung](https://togithub.com/JLHwung))

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