Make Apartment compatible with Rails 7

The `database:` argument from the `connected_to` method was deprecated
in Rails 6.1 [1] and removed in Rails 7.0 [2]. The ros-apartement gem
has already introduced fixes for this issue [3][4], but there has been
no release including these fixes.

So we're applying the fix in our code.

Note that, since Apartment already overwrites the `connected_to` method
by creating a `connected_to_with_tenant` method, we're calling the
`connected_to_without_tenant` method inside the patch, which is
equivalent to ActiveRecord's original `connected_to`.

[1] Pull request 37874 in https://github.com/rails/rails
[2] Pull request 40530 in https://github.com/rails/rails/pull
[3] Pull request 194 in https://github.com/rails-on-services/apartment
[4] Pull request 243 in https://github.com/rails-on-services/apartment

config/initializers/apartment.rb

@@ -1,3 +1,20 @@
+module ActiveRecord # TODO: Remove after upgrading ros-apartment
+  # Code based on the current (as of March 2024) development version of the apartment gem
+  module ConnectionHandling
+    def connected_to_with_rails7_tenant(role: nil, prevent_writes: false, &blk)
+      current_tenant = Apartment::Tenant.current
+
+      # The connected_to_without_tenant method is defined by Apartment
+      connected_to_without_tenant(role: role, prevent_writes: prevent_writes) do
+        Apartment::Tenant.switch!(current_tenant)
+        yield(blk)
+      end
+    end
+
+    alias connected_to connected_to_with_rails7_tenant
+  end
+end
+
 # You can have Apartment route to the appropriate Tenant by adding some Rack middleware.
 # Apartment can support many different "Elevators" that can take care of this routing to your data.
 # Require whichever Elevator you're using below or none if you have a custom one.