python-websocket-client: update to 1.6.1

- 1.6.1
  - Fix Dispatcher keyboard interrupt. Should solve reconnect loop
  with rel

- 1.6.0
  - Fix teardown issue when ping thread is not properly ended
  - Fix double ping wait time on first ping
  - Minor typehints improvements

- 1.5.3
  - Add logic to avoid error in the case where content-length header
  does not exist, bug introduced in 1.5.2
  - Fix wsdump.py script typing, bug introduced in 1.5.2

- 1.5.2
  - Add typehints
  - Fix pytype errors
  - Fix args passed to logging function
  - Standardize PEP 3101 formatting
  - Add more verbose exception for unsuccessful handshake

Signed-off-by: Javier Marcet <javier@marcet.info>