[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3973: Update twisted for type checker

[Tahoe-LAFS]

#3973: Update twisted for type checker
-------------------------+---------------------------
 Reporter:  daniellee    |          Owner:  daniellee
     Type:  enhancement  |         Status:  new
 Priority:  minor        |      Milestone:  undecided
Component:  unknown      |        Version:  n/a
 Keywords:               |  Launchpad Bug:
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 Currently, when type checking, we use an old version of twisted since
 typechecks job is broken on CI for master at HEAD. Fix integration with &
 update to latest twisted.

 From tox.ini line 143:
 # Twisted 21.2.0 introduces some type hints which we are not yet
 # compatible with.
 # https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3622
 twisted<21.2.0

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3973>
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