DEV: Upgrade to Rails 7

This patch upgrades Rails to version 7.0.2.4.

Gemfile

@@ -18,7 +18,7 @@ else
   # this allows us to include the bits of rails we use without pieces we do not.
   #
   # To issue a rails update bump the version number here
-  rails_version = '6.1.4.7'
+  rails_version = '7.0.2.4'
   gem 'actionmailer', rails_version
   gem 'actionpack', rails_version
   gem 'actionview', rails_version
@@ -68,7 +68,7 @@ gem 'http_accept_language', require: false
 gem 'discourse-ember-rails', '0.18.6', require: 'ember-rails'
 gem 'discourse-ember-source', '~> 3.12.2'
 gem 'ember-handlebars-template', '0.8.0'
-gem 'discourse-fonts'
+gem 'discourse-fonts', require: 'discourse_fonts'
 
 gem 'barber'
 
@@ -190,7 +190,7 @@ if ENV["ALLOW_DEV_POPULATE"] == "1"
   gem 'discourse_dev_assets'
   gem 'faker', "~> 2.16"
 else
-  group :development do
+  group :development, :test do
     gem 'discourse_dev_assets'
     gem 'faker', "~> 2.16"
   end
@@ -268,3 +268,7 @@ gem 'colored2', require: false
 gem 'maxminddb'
 
 gem 'rails_failover', require: false
+
+# workaround for faraday-net_http, see
+# https://github.com/ruby/net-imap/issues/16#issuecomment-803086765
+gem 'net-http'