[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3810: macOS builds on GitHub now failing on Python 2.7

[Tahoe-LAFS]

#3810: macOS builds on GitHub now failing on Python 2.7
----------------------+---------------------------
 Reporter:  itamarst  |          Owner:  itamarst
     Type:  defect    |         Status:  new
 Priority:  normal    |      Milestone:  undecided
Component:  unknown   |        Version:  n/a
 Keywords:            |  Launchpad Bug:
----------------------+---------------------------
 GitHub just switched macOS builders to macOS 11 (docs don't reflect this,
 but CI output does). Python 2.7 is not available on this builder, so need
 to switch to using `macos-10.15` builder which is what was previously
 used.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3810>
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