Upgrade to chokidar to 4.0

[zachleat]

https://github.com/paulmillr/chokidar/releases/tag/4.0.0

The big difference here is that it drops globs support, which we used both internally and via a public configuration API here: https://www.11ty.dev/docs/watch-serve/#add-your-own-watch-targets

Related #3149

[talentlessguy]

11ty depends on fast-glob, which can be put on top of chokidar for glob matching