The code to try to find the rollup configuration file iterates up the directory tree until either the config is found or we hit the root. Unfortunately, this was comparing a `Path` object (for the current path) against `str` (for the root), which always evaluates to `False`. The result was that if there's no rollup config, we'd end up infinitely looping comparing `Path('/')` to `/`. This change fixes that. Testing Done: Tried to load an extension which defined an `index.ts` file in its bundles but did not have a `rollup.config.js` file. Saw that we no longer hit the infinite loop.