fix: don't include websockets in node bundle

[merceyz]

The WebSockets implementation is included in the bundle for Node.js even though it isn't used, the esbuild bundle analyser explains why it's included:

lib/websocket/websocket.js
This file is included in the bundle because:

Entry point index-fetch.js contains:
require("./lib/fetch");

Required file lib/fetch/index.js contains:
require("../../index");

Required file index.js contains:
require("./lib/websocket/websocket");

So required file lib/websocket/websocket.js is included in the bundle.

Ref #1868 (comment)

[codecov-commenter]

Codecov Report

Base: 90.35% // Head: 90.35% // No change to project coverage 👍

Coverage data is based on head (9f19e48) compared to base (2d2512c).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1869   +/-   ##
=======================================
  Coverage   90.35%   90.35%           
=======================================
  Files          70       70           
  Lines        6042     6042           
=======================================
  Hits         5459     5459           
  Misses        583      583           

Impacted Files	Coverage Δ
lib/fetch/index.js	84.83% <100.00%> (ø)

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