Remove kleur

[fraxken]

Since Node.js v21 a new native styleText has been introduced

const { styleText } = require('node:util');
const errorMessage = styleText('red', 'Error! Error!');
console.log(errorMessage);

The next major could drop that dependency to use that instead

Spinner/src/Spinner.class.ts

Lines 19 to 21 in 4b32b1d

	const kLogSymbols = process.platform !== "win32" || process.env.CI || process.env.TERM === "xterm-256color" ?
	{ success: kleur.bold().green("✔"), error: kleur.bold().red("✖") } :
	{ success: kleur.bold().green("√"), error: kleur.bold().red("×") };

However we have to see if that break the "color" option