[MacPorts] #58621: youtube-upload: drop python26 variant

[MacPorts]

#58621: youtube-upload: drop python26 variant
----------------------+----------------------------
 Reporter:  yan12125  |      Owner:  ryandesign
     Type:  defect    |     Status:  assigned
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:            |       Port:  youtube-upload
----------------------+----------------------------
 youtube-upload +python26 has been broken for a while. py26-gdata and
 py26-progressbar were removed in 2016 (1).
 Later in 2017, py26-curl was also removed (2) as pycurl no longer supports
 Python 2.6 since version 7.43.0.2 (3).

 I propose to drop +python26 from youtube-upload.

 (1) https://github.com/macports/macports-
 ports/commit/402290e78498ce08f8a18f2c5216bac395e6fa6a

 (2) https://github.com/macports/macports-
 ports/commit/df419609a3931cd75090442ec4bf4f8a6b43d9c3

 (3)
 https://github.com/pycurl/pycurl/commit/cad5d37b2365d5158839acf27f25bb40bbd17d06

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Ticket URL: <https://trac.macports.org/ticket/58621>
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