Fix toString() output · sinonjs/fake-timers@9fdc01e

The following actions use a deprecated Node.js version and will be forced to run on node20: actions/checkout@v3, actions/setup-node@v3. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/

ESLint: src/fake-timers-src.js#L27

Syntax error in type: function(IdleDeadline)

ESLint: src/fake-timers-src.js#L54

Missing JSDoc @Property "requestAnimationFrame" description

ESLint: src/fake-timers-src.js#L60

Missing JSDoc @Property "now" description

ESLint: src/fake-timers-src.js#L351

Missing JSDoc @returns declaration

ESLint: src/fake-timers-src.js#L431

Missing JSDoc @returns type

ESLint: src/fake-timers-src.js#L467

The type 'ClockDate' is undefined

ESLint: src/fake-timers-src.js#L663

JSDoc @returns declaration present but return expression not available in function

ESLint: src/fake-timers-src.js#L794

Missing JSDoc @returns declaration

ESLint: src/fake-timers-src.js#L805

Missing JSDoc @returns declaration

ESLint: src/fake-timers-src.js#L816

Missing JSDoc @returns declaration

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