fix: updates MockInstance generics

[falecci]

When running the workshop app, in the 04. Globals / 01. Global Methods exercise, there is a bonus point that talks about extending the global types to access console.log.mock.calls which otherwise would throw a type error (http://localhost:5639/exercise/04/01/solution#bonus-type-safe-global-spies)

The proposed code to do so is:

import { MockInstance } from 'vitest'

declare namespace console {
  var log: Console['log'] &
    MockInstance<Parameters<Console['log']>, ReturnType<Console['log']>>
}

But I don't think that's valid anymore since my TS compiler was complaining. The actual usage seems to be much simpler:

import { MockInstance } from "vitest";

declare namespace console {
  var log: Console["log"] &
    MockInstance<Console["log"]>;
}

While searching for docs, it seems this change has been introduced in Vitest 2.0: https://vitest.dev/guide/migration#simplified-generic-types-of-mock-functions-e-g-vi-fn-t-mock-t