test-kitchen 3.5.1

[SMillerDev]

Created with brew bump-formula-pr.

release notes

## What's Changed
* Doc Updates for vRA and dokken  by @ashiqueps in https://github.com/test-kitchen/test-kitchen/pull/1925
* Added documentation for --platform option on kitchen-dokken by @ashiqueps in https://github.com/test-kitchen/test-kitchen/pull/1927
* Remove bundler dev dep by @tas50 in https://github.com/test-kitchen/test-kitchen/pull/1924
* Removed the documentation of obsolete configurations by @ashiqueps in https://github.com/test-kitchen/test-kitchen/pull/1930
* Update fakefs requirement from ~> 1.0 to ~> 2.0 by @dependabot in https://github.com/test-kitchen/test-kitchen/pull/1929
* Update mocha requirement from ~> 1.1 to ~> 2.0 by @dependabot in https://github.com/test-kitchen/test-kitchen/pull/1920
* Fix capitalization of PowerShell by @tas50 in https://github.com/test-kitchen/test-kitchen/pull/1935
Full Changelog: test-kitchen/test-kitchen@v3.5.0...v3.5.1