py-fasteners: updated to 0.19

0.19
- Add `.acquire_read_lock`, `.release_read_lock`, `.acquire_write_lock`, and
  `.release_write_lock` methods to the inter thread `ReaderWriterLock` as was
  promised in the README.
- Remove support for python 3.7 and pypy 3.7. It should still work, but is no
  longer tested.
- Add support for pypy 3.10 and python 3.11

(adam)