py-pyrsistent: updated to 0.19.1

0.19.1, 2022-10-30
* Fix 159. Pmap keys/values/items now behave more like the corresponding Python 3
  methods on dicts. Previously they returned a materialized PVector holding the items, now they return
  views instead. This is a slight backwards incompatibility compared to previous behaviour, hence stepping
  version to 0.19. Thanks @noahbenson for this!
* Fix 244, type for argument to PVector.delete missing. @thanks dscrofts for this!
* Fix 249, rename perf test directory to avoid tripping up automatic discovery in more recent setuptools versions
* Fix 247, performance bug when setting elements in maps and adding elements to sets
* Fix 248, build pure Python wheels. This is used by some installers. Thanks @andyreagan for this!
* Fix 254, 258, support manylinux_2014_aarch64 wheels. Thanks @Aaron-Durant for this!

0.19.0 - Never released due to issues found on test-PyPI

(adam)