chore: simplify implementation of act

[yanick]

@mcous Your #288 made me look at the implementation of act(), and I think it can be simplified as per this PR.

[mcous]

LGTM! Ever so slightly different behavior if fn is synchronous, but I don't think that really matters given we'll always get a Promise back from tick

[yanick]

LGTM! Ever so slightly different behavior if fn is synchronous, but I don't think that really matters given we'll always get a Promise back from tick

Yup, and even if fn is synchronous, await in await fn() will be a no-op (unless fn() is a synchronous function and does return a promise, but even then I think the behavior ends up being the same).

[github-actions]

🎉 This PR is included in version 4.1.0 🎉

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