[tor-bugs] #30877 [Core Tor/Stem]: Remove 0.3.4 and experimental-0.4.0 from stem's CI, and note that stable is now 0.4.0

[Tor Bug Tracker & Wiki]

#30877: Remove 0.3.4 and experimental-0.4.0 from stem's CI, and note that stable is
now 0.4.0
-------------------------------+--------------------------------------
     Reporter:  teor           |      Owner:  teor
         Type:  defect         |     Status:  assigned
     Priority:  Medium         |  Milestone:  Tor: 0.4.1.x-final
    Component:  Core Tor/Stem  |    Version:
     Severity:  Normal         |   Keywords:  041-should, stem-ci-fail
Actual Points:  0.1            |  Parent ID:  #30827
       Points:  0.1            |   Reviewer:
      Sponsor:  Sponsor31-can  |
-------------------------------+--------------------------------------
 We removed some builds as part of #30836, so we need to fix CI.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30877>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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