Make sure to pass URI's to `:git`
Make sure to pass URI's to `:git`

Passing paths should work in most cases, but on Windows the driver
letter is interpreted as the scheme and causes some case mismatches
because

```
irb> URI.parse("E:").to_s
=> "e:"
```

We fix this by passing file URI's instead.

bundler/bundler,bundler/bundler