Un-fork `urllib3`

# What
Use a released upstream release of Python's [`urllib3`](https://urllib3.readthedocs.io/en/stable/).

# Why
We can get automatic updates and now longer depend on some private fork.

# How
Wait for:

- https://github.com/urllib3/urllib3/pull/3593
- https://github.com/golemcloud/urllib3/pull/2

to be merged & released and then replace our pinned version here:

https://github.com/influxdata/datafusion-udf-wasm/blob/333d53560a5d286c77176ccee20fb47c5162b8f9/guests/python/requirements.txt#L1-L2

Check the upstream urllib3 PRs linked in the issue and wait for their merge and release. Then update the pinned urllib3 version in guests/python/requirements.txt at the referenced lines, and verify that the dependency no longer points to the private fork.

Written by the indexing model from the issue text.