Rename fixture_path → fixture_paths in rspec config

Rails 7.2 deprecates the singular fixture_path setter on
ActiveSupport::TestCase. rspec-rails 6.1+ exposes the plural
form, which takes an array of paths and is the long-term API
on both 7.1 and 7.2. Direct rewrite — no NextRails.next? branch
needed, and no behavior change since we still point at a single
spec/fixtures directory.

Ref: https://github.com/rspec/rspec-rails/blob/main/Changelog.md#610--2023-11-21

Author: JuanVqz

spec/rails_helper.rb

@@ -95,7 +95,7 @@ def executor_around_each_request
   include Warden::Test::Helpers
 
   # Remove this line if you're not using ActiveRecord or ActiveRecord fixtures
-  config.fixture_path = "#{::Rails.root}/spec/fixtures"
+  config.fixture_paths = ["#{::Rails.root}/spec/fixtures"]
 
   # If you're not using ActiveRecord, or you'd prefer not to run each of your
   # examples within a transaction, remove the following line or assign false