[tahoe-lafs-trac-stream] [Tahoe-LAFS] #4035: Upgrade to modern MyPy

[Tahoe-LAFS]

#4035: Upgrade to modern MyPy
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 Reporter:  itamarst     |          Owner:
     Type:  enhancement  |         Status:  new
 Priority:  normal       |      Milestone:  undecided
Component:  unknown      |        Version:  n/a
 Keywords:               |  Launchpad Bug:
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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4035>
Tahoe-LAFS <https://Tahoe-LAFS.org>
secure decentralized storage