Update dependency fs-extra to v9

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
fs-extra	dependencies	major	8.0.1 -> 9.0.0

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Release Notes

jprichardson/node-fs-extra

v9.0.0

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Breaking changes

• Requires Node.js version 10 or greater (#​725, #​751)
• Switched ensureDir* to use a fork of https://github.com/sindresorhus/make-dir to make use of native recursive fs.mkdir where possible (#​619, #​756)
• Properly preserve atime for copy* with preserveTimestamps option (#​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, #​768)
• Cannot pass null as an options parameter to *Json* methods (#​745, #​768)

Improvements

• Add promise shims for fs.writev & fs.opendir (#​747)
• Better errors for ensureFile (#​696, #​744)
• Better file comparison for older Node versions (#​694)

Miscellaneous changes

• Peformance optimizations (#​762, #​764)
• Add missing documentation for aliases (#​758, #​766)
• Update universalify dependency (#​767)

v8.1.0

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• Add support for promisified fs.realpath.native in Node v9.2+ (#​650, #​682)
• Update graceful-fs dependency (#​700)
• Use graceful-fs everywhere (#​700)

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