Switched to numo-narray-alt [skip ci]

Author: ankane

Gemfile

@@ -4,7 +4,7 @@ gemspec
 
 gem "rake"
 gem "minitest"
-gem "numo-narray", platform: :mri
+gem "numo-narray-alt", platform: :mri
 gem "pg", platform: :ruby
 gem "jdbc-postgres", platform: :jruby
 gem "sequel"