### What?
Fixes an infinite loop that may occur when invoking the findUp() utility
to search for a file by name and no result is found.
### Why?
If triggered, the infinite loop will hang the entire application. For
example, this occurs when trying to boot Payload from a Cloudflare
Worker, as reported in #12327
### How?
By checking whether it has reached the root directory before analysing
the parent folder
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