chore: add FreeBSD to list of OSes for esbuild

[feld]

This saves me from having to patch this in our build environment for each new release

[feld]

After more testing, this fixes that one problem but my efforts to make pnpm stop downloading the prebuilt rpc servers / cores for other OSes/arches has hit a wall.

If I just patch the package.json to only list "freebsd" in the os list, that fixes it... so I may have to keep patching this anyway

[WofWca]

So do you think that it's semantically correct to add freebsd to supportedArchitectures? IMU you made it work on FreeBSD, but you have to do some patching, as you say? Or is this patching only about the offline build, which is only required by package repositories, and is not directly related to supportedArchitectures?