Update p5.js version to v1.4.2

[catarak]

How would this new feature help increase access to the p5.js Editor?

Making the p5.js Editor stable makes the p5.js Editor accessible!

Feature enhancement details:

Update the p5.js Editor so that the default version for new sketches, as well as the example sketches, is v1.4.2.

[Qianqianye]

We should update the p5.js version on web editor to v1.5.0 🎉

[SableRaf]

Working on it! I just need a moment to clean up and test locally.