Update dependency fs-extra to v9

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
fs-extra	devDependencies	major	8.1.0 -> 9.0.0

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Release Notes

jprichardson/node-fs-extra

### [`v9.0.0`](https://togithub.com/jprichardson/node-fs-extra/blob/master/CHANGELOG.md#​900--2020-03-19) [Compare Source](https://togithub.com/jprichardson/node-fs-extra/compare/8.1.0...9.0.0) ##### Breaking changes - Requires Node.js version 10 or greater ([#​725](https://togithub.com/jprichardson/node-fs-extra/issues/725), [#​751](https://togithub.com/jprichardson/node-fs-extra/pull/751)) - Switched `ensureDir*` to use a fork of to make use of native recursive `fs.mkdir` where possible ([#​619](https://togithub.com/jprichardson/node-fs-extra/issues/619), [#​756](https://togithub.com/jprichardson/node-fs-extra/pull/756)) - Properly preserve `atime` for `copy*` with `preserveTimestamps` option ([#​633](https://togithub.com/jprichardson/node-fs-extra/pull/633)) **The following changes, allthough technically breaking, will not affect the vast majority of users:** - `outputJson` now outputs objects as they were when the function was called, even if they are mutated later ([#​702](https://togithub.com/jprichardson/node-fs-extra/issues/702), [#​768](https://togithub.com/jprichardson/node-fs-extra/pull/768)) - Cannot pass `null` as an options parameter to `*Json*` methods ([#​745](https://togithub.com/jprichardson/node-fs-extra/issues/745), [#​768](https://togithub.com/jprichardson/node-fs-extra/pull/768)) ##### Improvements - Add promise shims for `fs.writev` & `fs.opendir` ([#​747](https://togithub.com/jprichardson/node-fs-extra/pull/747)) - Better errors for `ensureFile` ([#​696](https://togithub.com/jprichardson/node-fs-extra/issues/696), [#​744](https://togithub.com/jprichardson/node-fs-extra/pull/744)) - Better file comparison for older Node versions ([#​694](https://togithub.com/jprichardson/node-fs-extra/pull/694)) ##### Miscellaneous changes - Peformance optimizations ([#​762](https://togithub.com/jprichardson/node-fs-extra/issues/762), [#​764](https://togithub.com/jprichardson/node-fs-extra/pull/764)) - Add missing documentation for aliases ([#​758](https://togithub.com/jprichardson/node-fs-extra/issues/758), [#​766](https://togithub.com/jprichardson/node-fs-extra/pull/766)) - Update `universalify` dependency ([#​767](https://togithub.com/jprichardson/node-fs-extra/pull/767))

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