Bump fakefs from 2.5.0 to 2.7.1

Bumps [fakefs](https://github.com/fakefs/fakefs) from 2.5.0 to 2.7.1.
- [Release notes](https://github.com/fakefs/fakefs/releases)
- [Changelog](https://github.com/fakefs/fakefs/blob/master/CHANGELOG.md)
- [Commits](fakefs/fakefs@v2.5.0...v2.7.1)

---
updated-dependencies:
- dependency-name: fakefs
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile.lock

@@ -38,7 +38,7 @@ GEM
       addressable (~> 2.8)
     drb (2.2.1)
     excon (0.111.0)
-    fakefs (2.5.0)
+    fakefs (2.7.1)
     faraday (2.10.0)
       faraday-net_http (>= 2.0, < 3.2)
       logger