Drop Ruby < 3.1 and Rails < 7.0 support, fix Rails 8.1 router deprecation

[Copilot]

Fixes Rails 8.1 deprecation warning for router keyword arguments and removes support for EOL Ruby/Rails versions per issue requirements.

Changes

Router keyword args deprecation fix

• Remove Rails 5.2 version check in lib/apipie/routing.rb, always use keyword arguments:

# Before
Rails.version >= "5.2" ? get(**get_args) : get(get_args)

# After
get(**get_args)

Minimum version constraints

• Ruby: >= 2.6.0 → >= 3.1.0
• Rails (actionpack, activesupport): >= 5.0 → >= 7.0
• Remove Ruby 2.7 conditional for rubocop-rspec_rails dependency

Rubocop modernization

• Use plugins: instead of deprecated require: for extensions
• Update TargetRubyVersion: 2.6 → 3.1
• Fix deprecated cop: Naming/PredicateName → Naming/PredicatePrefix
• Regenerate .rubocop_todo.yml

Version bump

• 1.5.0 → 1.6.0 (minor bump for breaking changes)
• Update CHANGELOG.md with breaking change notice

Original prompt

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This section details on the original issue you should resolve

<issue_title>Fix Rails 8.1 router keyword args deprecation warning</issue_title>
<issue_description>@copilot Can you reopen #962 as your own. you can use the branch named ruby8-copilot which is already set to 9283da9 by James Dean Shepherd.

Please check rubocop, why it fails. might need to update rubocop gems and run it with rubocop --regenerate-todo --no-auto-gen-timestamp --exclude-limit 250

remove conditions around Rails 5.x and 6.x.
Update constraint to support only ruby >= 3.1 and rails >= 7.0,
update Changelog and bump to next minor version.

Thank you</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Fix Rails 8.1 router keyword args deprecation warning #963

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[ekohl]

Foreman still relies on Ruby 3.0 today and dropping that would severely hinder our ability to upgrade.