Absolute local paths on Windows not recognized

Sorry if I am using it wrong or it's duplicate report.

Running lychee (lychee-v0.11.1-windows-x86_64) on a local absolute path on Windows gives the following error:
```
>lychee.exe "C:\asd"
Error: Network error

Caused by:
    0: builder error for url (c:\asd): URL scheme is not allowed
    1: URL scheme is not allowed
```
Running it from that directory with `lychee.exe .` works!