Update test-kitchen requirement from ~> 1.16.0 to ~> 1.25.0

[dependabot-preview]

Updates the requirements on test-kitchen to permit the latest version.

Changelog

Sourced from test-kitchen's changelog.

v1.25.0 (2019-05-30)

Full Changelog

• Test Kitchen 1.x now supports accepting the license for Chef 15. See https://docs.chef.io/chef_license_accept.html#test-kitchen for details on using this new config option.
• Added a new --fail-fast command line option to fail when the first instance fails if using the -c concurrency option.
• policyfile_path config now accepts a relative paths
• Added a new berksfile_path config for specifying the path to your Berksfile
• Fixed psych gem warnings when running Ruby 2.6+
• Update kitchen init to use Ubuntu 18.04
• Remove constraints on specific net-scp and net-ssh-gateway gem releases
• Mildy modernize the kitchen driver init templates
• Improve error messages when the kitchen.yml files don't exist
• Improve chef logging / error messages
• Honor retries when ssh proxy returns an error
• Switch to new gem install parameters to support Ruby 2.6 and Chef 15

v1.24.0 (2018-12-26)

Full Changelog

Merged pull requests:

• Fixing two issues with the ChefDK build #1507 (tyler-ball)
• Remove the Gemfile pin on train .22 #1505 (tas50)
• Include list of known plugins when one cannot be loaded #1368 (robbkidd)

v1.23.5 (2018-12-10)

Full Changelog

Merged pull requests:

• Add back the gemspec and gemfile for appbundler #1504 (tas50)

v1.23.4 (2018-12-10)

Full Changelog

Merged pull requests:

• Add ruby 2.6 travis testing #1503 (tas50)
• Only ship the necessary files for Test Kitchen to run in the gem #1502 (tas50)
• Misc updates to the docs #1501 (tas50)

v1.23.3 (2018-11-30)

Full Changelog

Fixed bugs:

• Chef 13 Cookbook Root Aliases Not Found #1230

Closed issues:

... (truncated)

Commits

• feb224b Release 1.25.0
• a8a8e77 Call the license_check so it is performed
• 56e7ef0 Sync the remainder of the license changes from master
• 7990293 Update some of the Chef error / info messages
• 2a559be Accept the license in the appveyor kitchen config
• aec7442 Implement --fail-fast option
• 01619db rub more File.expand_path on this change
• d223049 Add berkshelf_path config option
• a4e67dc chefstylin'
• 3f8885a lowest psych version is 3.1.0 for kwargs
• Additional commits viewable in compare view

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