Robot Server: Remove wsproto workaround

[mcous]

Overview

In #6229, we switched our websockets library from the uvicorn default of websockets to wsproto, because uvicorn did not allow configuration of websocket's default 1 MB message size, whereas wsproto has no maximum message size. JSON protocols are often larger than 1 MB, so the hardcoded message limit was untenable. An unlimited message size, however, isn't great either!

As of uvicorn v0.14, the message limit for websockets has been made configurable and set to a default of 16 MB. Now that #8228 has upgraded uvicorn to v0.14, we should remove our wsproto workaround.

Advantages of websockets:

• A default, configurable message limit is safer than no limit
• wsproto doesn't appear to be under super active development
• Using uvicorn's default websockets library will likely have better long term support from uvicorn devs

Acceptance criteria

• wsproto removed as a robot-server dependency
• wsproto removed as a buildroot dependency (TODO: create Opentrons/buildroot ticket)