Add newer supported Ruby versions to CI matrix, drop <3.1 - #4
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rubocop/standard/parser were pinned to versions that relied on racc, mutex_m, and ostruct being bundled as Ruby default gems, which is no longer true on Ruby 3.3+. Updated the lint gems and added ostruct and fiddle as explicit dependencies so `rake` (test + standard) passes on Ruby 2.6 through 4.0.
CI's bundler-cache uses `bundle install --deployment`, which installs the exact versions in the single committed Gemfile.lock for every matrix job (no per-job re-resolution). That makes one lockfile the lowest common denominator across the whole Ruby matrix. minitest has no version supporting both Ruby 2.6 and 4.0 (versions through 5.26.0 cap at `< 4.0`; 5.26.1+ require `>= 2.7|3.1`), so 2.6 had to go. It's long EOL anyway. Bumped required_ruby_version to match. With the floor at 3.1, pulled rubocop/standard/parser up to current (avoiding the `prism` dependency, which needs Ruby >= 2.7, and newer `parallel`, which needs Ruby >= 3.3 - pinned `parallel < 2` and `minitest < 6` to stay compatible with 3.1). Also added `base64` as an explicit dependency: another default-gem-turned-bundled-gem that rubocop's HTML formatter needs but doesn't declare.
rosston
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Supported versions based on https://endoflife.date/ruby
This also drops support for Ruby <3.1. The versions in between 2.6 and 3.1 have been EOL for quite a while: