Update minitest requirement from ~> 5.3.1 to ~> 5.14.4

[dependabot-preview]

Updates the requirements on minitest to permit the latest version.

Changelog

Sourced from minitest's changelog.

=== 5.14.4 / 2021-02-23

• 1 bug fix:

  • Fixed deprecation warning using stub with methods using keyword arguments. (Nakilon)

=== 5.14.3 / 2021-01-05

• 1 bug fix:

  • Bumped require_ruby_version to < 4 (trunk = 3.1).

=== 5.14.2 / 2020-08-31

• 1 bug fix:

  • Bumped ruby version to include 3.0 (trunk).

=== 5.14.1 / 2020-05-15

• 3 minor enhancements:

  • Minitest.filter_backtrace returns original backtrace if filter comes back empty.
  • Minitest::BacktraceFilter now returns entire backtrace if $MT_DEBUG set in env.
  • Return true on a successful refute. (jusleg)

• 1 bug fix:

  • Fixed expectation doco to not use global expectations.

=== 5.14.0 / 2020-01-11

• 2 minor enhancements:

  • Block-assertions (eg assert_output) now error if raised inside the block. (casperisfine)
  • Changed assert_raises to only catch Assertion since that covers Skip and friends.

• 3 bug fixes:

  • Added example for value wrapper with block to Expectations module. (stomar)
  • Fixed use of must/wont_be_within_delta on Expectation instance. (stomar)
  • Renamed UnexpectedError#exception to #error to avoid problems with reraising. (casperisfine)

=== 5.13.0 / 2019-10-29

• 9 minor enhancements:

  • Added Minitest::Guard#osx?
  • Added examples to documentation for assert_raises. (lxxxvi)
  • Added expectations #path_must_exist and #path_wont_exist. Not thrilled with the names.

... (truncated)

Commits

• 3c6576a prepped for release
• 13c48a0 Improved test_stub_callable_keyword_args to test pass-through.
• 8a7ba81 - Re-fixed deprecation warning using stub with methods using keyword arguments.
• dfbde40 - ! Unfixed deprecation warning fix that broke in nearly every other version ...
• 9eb312b - Fixed deprecation warning using stub with methods using keyword arguments. ...
• 94faf7b Added a support matrix to the FAQ in README.rdoc
• b8fb101 prepped for release
• 8e55b9b - Bumped require_ruby_version to < 4 (trunk = 3.1).
• dc6ad17 prepped for release
• 9713c55 - Bumped ruby version to include 3.0 (trunk).
• Additional commits viewable in compare view

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