python3-urllib3: upgrade 2.0.3 -> 2.0.4

python3-urllib3: upgrade 2.0.3 -> 2.0.4

https://github.com/urllib3/urllib3/blob/main/CHANGES.rst#204-2023-07-19

2.0.4 (2023-07-19)
* Added support for union operators to HTTPHeaderDict (#2254)
* Added BaseHTTPResponse to urllib3.__all__ (#3078)
* Fixed urllib3.connection.HTTPConnection to raise the http.client.connect
  audit event to have the same behavior as the standard library HTTP client
  (#2757)
* Relied on the standard library for checking hostnames in supported PyPy
  releases (#3087)

Signed-off-by: Tim Orling <tim.orling@konsulko.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>