Remove suggested use of utf-8-validate since node 18.14+ supports it natively

[JMTK]

Which application or package is this feature request for?

discord.js

Feature

As of v18.14.0, the ws package will prefer using the native function if it exists.

Reference: https://github.com/websockets/ws/blob/019f28ff1ffddfcdc428d1de5ecd98648057a2ab/lib/validation.js#L138

Ideal solution or implementation

Remove from the README.md. bufferutil would still be required

Alternative solutions or implementations

No response

Other context

The biggest issue is that the current engine is >=18, but this is only on 18.14+. For that reason, that might need to be semver major still