Add explicit dependencies for gems moving out of core

Also unmark notification specs as pending

Gemfile

@@ -33,4 +33,9 @@ group :test do
   gem "ruby-oci8", platforms: :ruby if ENV["ROM_USE_ORACLE"]
   gem "sequel_pg", require: false, platforms: :ruby
   gem "sqlite3", "~> 1.4", platforms: :ruby
+
+  if RUBY_VERSION.start_with?("3.4")
+    gem "mutex_m"
+    gem "ostruct"
+  end
 end

spec/integration/support/active_support_notifications_spec.rb

@@ -9,7 +9,7 @@
 
   include_context "users"
 
-  xit "works" do
+  it "works" do
     container.gateways[:default].use_logger(LOGGER)
 
     sql = nil

spec/integration/support/rails_log_subscriber_spec.rb

@@ -1,13 +1,9 @@
 # frozen_string_literal: true
 
 require "spec_helper"
+require "active_support/log_subscriber/test_helper"
 
 RSpec.describe "Rails log subscriber", :postgres, seeds: false do
-  before(:all) do
-    require "active_support/log_subscriber/test_helper"
-  rescue LoadError
-  end
-
   before do
     ROM::SQL.load_extensions(:active_support_notifications, :rails_log_subscriber)
   end
@@ -29,7 +25,7 @@
     container.gateways[:default].use_logger(logger)
   end
 
-  xit "works" do
+  it "works" do
     conn.run(test_query)
 
     expect(logger.logged(:debug).last).to include(test_query)