[bug report] Wireit watch crashes recursively looping symbolic links in a npm workspaces context.

## Describe the bug
It seems that wireit follows symbolic links when using the `--watch` option, it would work fine in most of cases but there is a rare one where if a project in a monorepo (npm workspaces) depends on the root project then it will keep looping inside the `node_modules` directory.
Here's a screenshot of what could possibly happens :

## To Reproduce
Best way to reproduce that is to actually try it in a real case scenario:
- Open a codespace (or clone on your local machine) material-web repository (https://github.com/material-components/material-web)
- Install the dependencies (`npm i`)
- Go inside catalog directory (`cd catalog`)
- Try to build watch (`npm run build:dev --watch`)

You should see the problem.

## Priority
This is probably a rare case but right now it's impossible for some users to contribute to the material-web catalog repository because of this issue.
Could happen to any monorepo project that set the root as one workspace (e.g. `"workspaces": [".", "foo"]`)

## Version
wireit : 0.9.0