Fix Issue #1465: Rails 7.2 ActiveSupport::Deprecation compatibility

[takaokouji]

Summary

Fixes JSONAPI-Resources#1465 by updating the deprecation warning system to be compatible with Rails 7.2, which made ActiveSupport::Deprecation.warn a private method.

Problem

In Rails 7.2, calling ActiveSupport::Deprecation.warn as a class method raises:

NoMethodError: private method 'warn' called for class ActiveSupport::Deprecation

This breaks deprecation warnings throughout the gem, causing failures during rails app:update and normal operation.

Root Cause

Rails 7.2 changed ActiveSupport::Deprecation.warn from a public class method to a private method, requiring users to instantiate the Deprecation class first.

Solution

Updated JSONAPI.warn_deprecated helper to:

1. Try calling as class method (Rails < 7.2)
2. On NoMethodError, create instance and call warn on it (Rails 7.2+)
3. Fallback to Kernel#warn for non-Rails environments

def self.warn_deprecated(message)
  if defined?(ActiveSupport::Deprecation)
    begin
      ActiveSupport::Deprecation.warn(message)
    rescue NoMethodError
      # Rails 7.2+
      version = defined?(JSONAPI::Resources::VERSION) ? JSONAPI::Resources::VERSION : '0.11.0'
      deprecation = ActiveSupport::Deprecation.new(version, 'jsonapi-resources')
      deprecation.warn(message)
    end
  else
    warn "[DEPRECATION] #{message}"
  end
end

Testing

• All 694 tests pass
• Added tests to verify deprecation system works correctly
• Compatible with Rails 6.1+ through 7.2+

Related

• Upstream issue: https://github.com/cerebris/jsonapi-resources/issues/1465
• Similar issues: rails_admin #3718, exception_notification Add Docker support for multi-version Rails testing #10

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