In this sentence, "that brings us to" means "that leads us to the next point" or "that naturally makes us think about." It's a way to transition the conversation to the topic of what to bring.

We are now going to talk about.....

In this case, the previous conversation was about inviting friends to an event. The phrase "that brings us to" is used to shift the conversation to the next logical question: what should they bring to the event.

This phrase is indirectly comparing a conversation to a map or journey. If we imagine the rest of the dialog, 2 friends are throwing a party and are still planning it. They need to pick a location and time, invite guests, and bring food. If they were following a map, they might start at a house then follow a road to the store then walk a path to the park. Once they do one thing, the next thing follows. If the conversation were a road, it has taken them to the next topic for discussion, in this case planning what to bring.