maintainer-feedback requested: [Bug 255547] devel/py-twisted: Update to 21.2.0

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Bugzilla Automation <bugzilla at FreeBSD.org> has asked freebsd-python (Nobody)
<python at FreeBSD.org> for maintainer-feedback:
Bug 255547: devel/py-twisted: Update to 21.2.0
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255547



--- Description ---
This patch updates devel/py-twisted to 21.2.0. This might be particularly
interesting for us since this version now officially supports and tests for
python38. 

>From a ports perspective, I've mainly synced the dependencies with those in
setup.cfg. I've also raised the minimum python requirement to 3.7+ due to the
dependency on contextvars, which would need a backported contextvars for python
3.5 and 3.6, which we don't have in ports as far as I can tell.

This port also breaks the current version of py-treq but the version proposed
in Bug 251848 builds, tests and runs fine with this port.

portlint: "looks fine."
testport: OK (poudriere: 122amd64)
do-test: "OK?" FAILED (skips=2626, expectedFailures=3, failures=14, errors=26,
successes=9760)

A note on the testsuite: This result appears to be identical to the testsuite
failures with our current twisted port. I'm not quite sure what to do about
this, as I'm not an expert on py-twisted. :/

The port has been running fine in production for the past week with the
aforementioned treq update and py-matrix-synapse.