Update minitest requirement from ~> 5.20.0 to ~> 5.21.1

[dependabot]

Updates the requirements on minitest to permit the latest version.

Changelog

Sourced from minitest's changelog.

=== 5.21.1 / 2024-01-11

• 1 bug fix:

  • Rails' default backtrace filter can't currently work with caller_locations, so reverting back to caller.

=== 5.21.0 / 2024-01-11

• 10 minor enhancements:

  • Add include_all kw arg to assert_respond_to and refute_respond_to.
  • Added --quiet flag to skip ProgressReporter (prints the dots). Minor speedup.
  • Added Minitest::Compress#compress and added it to UnexpectedError.
  • Added ability to initialize BacktraceFilter w/ custom regexp.
  • Filter failure backtraces using backtrace_filter before calculating location. (thomasmarshall)
  • Make BacktraceFilter#filter compatible with locations (still compares strings).
  • Optimized Assertion#location ~30%.
  • Output relative paths for all failures/errors/backtraces.
  • Refactored location information in assertions, now using locations.
  • Removed thread and mutex_m dependencies. (hsbt, eregon)

• 2 bug fixes:

  • Drop undocumented bt arg in #skip. Dunno why that ever happened, prolly for testing?
  • Fix mock to work with ruby debugger enabled. (keithlayne)

Commits

• 8ccc4d9 prepped for release
• 9f78d3a - Rails' default backtrace filter can't currently work with caller_locations,...
• 4a90528 prepped for release
• ea319f7 + Added Minitest::Compress#compress and added it to UnexpectedError
• 43d4efc + Filter failure backtraces using backtrace_filter before calculating locatio...
• 024e315 better
• 2751c9d + Added ability to initialize BacktraceFilter w/ custom regexp.
• 71340b6 Add changelog link to README and gem specification. (mattbrictson)
• e018bd3 Fix rdoc to prevent wrong links and wrong quotes (stomar)
• e410bad + Output relative paths for all failures/errors/backtraces
• Additional commits viewable in compare view

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