Replace the ffaker gem by the faker

[byhbt]

hi!

Originally, the ffaker is a fork of the faker gem. However, upon comparing the current status of both repositories, I have observed that the faker gem is more actively developed than ffaker.

FFaker: https://github.com/ffaker/ffaker/pulse
Faker:https://github.com/faker-ruby/faker/pulse

For instance, when it comes to the Fabricator for Date value, I have noticed that the faker gem provides more methods than ffaker.

FFaker: https://github.com/ffaker/ffaker/blob/main/REFERENCE.md#ffakerdate
Faker: https://www.rubydoc.info/gems/faker/Faker/Date

Therefore, I suggest updating our Rails template to use the faker gem instead of ffaker.

What are your thoughts? I am looking forward to hearing your feedback :)