gnu: ruby-actionmailbox: Update package.

* gnu/packages/rails.scm (ruby-actionmailbox):
[propagated-inputs]: Remove ruby-net-imap, ruby-net-pop,
ruby-net-smtp.

The reason for this removal is that they are bundled with Ruby from
3.1.0 onwards, and were conflicting for some reason.

Signed-off-by: Sharlatan Hellseher <sharlatanus@gmail.com>

gnu/packages/rails.scm

@@ -799,10 +799,7 @@ allowing files to be attached to ActiveRecord models.")
            ruby-activerecord
            ruby-activestorage
            ruby-activesupport
-           ruby-mail
-           ruby-net-imap
-           ruby-net-pop
-           ruby-net-smtp))
+           ruby-mail))
     (synopsis "Receive and process incoming emails in Rails applications")
     (description
      "ActionMailbox receives and processes incoming emails in Rails applications.")