chore: Update fakefs requirement from ~> 2.8.0 to ~> 3.0.0 (#1050)

Updates the requirements on [fakefs](https://github.com/fakefs/fakefs) to permit the latest version.
- [Release notes](https://github.com/fakefs/fakefs/releases)
- [Changelog](https://github.com/fakefs/fakefs/blob/master/CHANGELOG.md)
- [Commits](fakefs/fakefs@v2.8.0...v3.0.0)

---
updated-dependencies:
- dependency-name: fakefs
  dependency-type: direct:development
...

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Author: dependabot[bot]

Gemfile

@@ -16,7 +16,7 @@ source 'https://rubygems.org'
 gemspec
 
 gem 'appium_thor', '~> 2.0'
-gem 'fakefs', '~> 2.8.0'
+gem 'fakefs', '~> 3.0.0'
 gem 'hashdiff', '~> 1.1.0'
 gem 'minitest', '~> 5.0'
 gem 'minitest-reporters', '~> 1.1'