test!: Path `////path` causing failures

The path `////path` is causing issues with [most of the test fixtures.](https://github.com/gruns/furl/actions/runs/17632734482/job/50103086846)

https://github.com/gruns/furl/blob/f53defbf075e6f31c5b910aefb4221abe5b937cf/tests/test_furl.py#L1627C28-L1631C29

This is caused by the output of `f.url == '//////path'` instead of `'////path'`. This may be due to a change in the urllib library, but I am not sure.

The output of calling `urllib.parse.unparse` here:
https://github.com/gruns/furl/blob/f53defbf075e6f31c5b910aefb4221abe5b937cf/furl/furl.py#L1826C9-L1832C11

actually generates the expected number of slashes:

**However**, because of [this code](https://github.com/gruns/furl/blob/f53defbf075e6f31c5b910aefb4221abe5b937cf/furl/furl.py#L1838C30-L1840C33), an extra 2 slashes are prepended, causing the output of `f.url` to be invalid.

> [!NOTE]
> This issue does not appear on python 3.8, but appears on all other tests, so this could be a problem caused by a change in the standard library, in which case, other functionality may need reviewing