Dogfooding lightpush v3

[adklempner]

This PR updates the dogfooding app to use a version of @waku/sdk pre-released from logos-messaging/js-waku#2501

1. Install and run the dogfooding app in lab.waku.org/examples/dogfooding
2. In the browser console, run localStorage.setItem("debug", "waku:light-push:*") to enable logs from the waku node
3. Click Start Continuous Sending
4. (Repeat above in another browser or on another machine)

The numbers sent/received by each instance should steadily increase.

Logs should include:

waku:light-push:protocol-handler:info Creating v3 RPC message +6ms
 waku:light-push:protocol-handler:info Creating v3 RPC message +257ms
 waku:light-push:protocol-handler:error Remote peer rejected with v3 status code 420: RLN validation failed +2s

We expect to see occasional RLN validation failed errors. Please report any other errors seen.