[openstreetmap/openstreetmap-website] Bump minitest (PR #6455)

[rkoeze]

### Description

This PR bumps and removes the version constraint for the minitest Gem. A version constraint [was first added back in 2013](https://github.com/openstreetmap/openstreetmap-website/commit/61dd2af0a0d952c9aabea92426e961cfc09b838b), but I don't see a reason to keep it around at this point. We're on Rails 8 and Ruby 3.2+. [Those are both compatible with the current version of minitest](https://github.com/minitest/minitest?tab=readme-ov-file#what-versions-are-compatible-with-what-or-what-versions-are-supported-). Changelog is [here](https://github.com/minitest/minitest/blob/master/History.rdoc) for the reviewer's convenience.

### How has this been tested?
The tests pass.

You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/6455

-- Commit Summary --

  * Bump minitest

-- File Changes --

    M Gemfile (2)
    M Gemfile.lock (2)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/6455.patch
https://github.com/openstreetmap/openstreetmap-website/pull/6455.diff

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