chore(deps): update dependency appraisal to '~> 2.5.0'

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
appraisal	'~> 2.2.0' → '~> 2.5.0'

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Release Notes

thoughtbot/appraisal (appraisal)

v2.5.0: 2.5.0

Compare Source

• Split binstubs from accepance test helpers install (#​209)
• Drop support for Travis CI (#​208)
• Fix missing source deprecation warning (#​207)
• Fix relativizing directory on non-path remotes (#​205)
• Fix broken logo on the README.md (#​197)
• Run specs with bundler 2.3.7 (#​194)
• Switch to using Bundler.with_original_env (#​202)
• Add options to customize generated gemfiles (#​191
• Fix __FILE__ and __dir__ in primary Gemfiles (#​193)
• Implement Bundler install_if (#​176)

v2.4.1: 2.4.1

Compare Source

• Explicit require for Set (#​184)
• Silence gem list command output (#​181)

v2.4.0: 2.4.0

Compare Source

• Add ability to remove gem from appraisal (#​171)

v2.3.0: 2.3.0

Compare Source

• Auto-install the right bundler version (#​168),
• Test against Ruby 2.4, 2.5, 2.6, 2.7 (#​166),
• Allow specifying the path option to bundler (#​165),
• Fix acceptance tests under JRuby (#​167),
• Make git_source work in nested groups (#​160),
• Drop MRI 1.8.7-2.2 support (#​158),
• Document all commands in README (#​142),
• Allow passing through of the full-index option. (#​137),
• Avoid line continuations without parentheses (#​138),
• Added RBX to the build matrix (#​117),
• Remove suggestion of RubyGems in Rakefiles (#​128),
• Update README.md to add appraisal in gemspec instead of Gemfile (#​122).

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