Remove explicit require of net-* gems

This has been fixed in Rails and it is not needed anymore

Author: tagliala

Gemfile

@@ -13,12 +13,4 @@ rails =
 
 gem 'rails', rails
 
-# Required for Rails 6.1.x with Ruby 3.1+
-if RUBY_VERSION >= '3.1'
-  gem 'net-smtp', require: false
-  gem 'net-imap', require: false
-  gem 'net-pop', require: false
-end
-
-
 gemspec