[tor-bugs] #30137 [Core Tor/Stem]: Update PyPI links

[Tor Bug Tracker & Wiki]

#30137: Update PyPI links
-------------------------+-------------------------------
 Reporter:  illia-v      |          Owner:  atagar
     Type:  enhancement  |         Status:  new
 Priority:  Low          |      Component:  Core Tor/Stem
  Version:               |       Severity:  Minor
 Keywords:               |  Actual Points:
Parent ID:               |         Points:
 Reviewer:  atagar       |        Sponsor:
-------------------------+-------------------------------
 pypi.org replaced pypi.python.org some time ago. All requests to
 pypi.python.org are redirected to pypi.org.

 https://packaging.python.org/guides/migrating-to-pypi-org/

 [https://github.com/illia-v/stem/commit/5aa0e5a318e6daca243f6ff96cbfdb1df6ed3199
 This commit] updates all links in the Stem project.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30137>
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