Bump fastify-websocket from 1.1.2 to 2.0.1

[coreyfarrell]

Caught this testing fastify next versions, this module currently installs fastify-plugin 1.x and 2.x. Upgrading fastify-websocket here eliminates fastify-plugin 1.x.

Checklist

• run npm run test and npm run benchmark
• tests and/or benchmarks are included
• documentation is changed or added
• commit message and code follows Code of conduct

[mcollina]

thanks!