Resolve proxy_test issues with websocket-client 1.9.0

[ArBridgeman]

Summary

When performing dependency updates in #269 and #272, it was noted that the proxy_test.py tests failed when we upgraded to websocket-client==1.9.0. The reason for the failing tests needs to be investigated and, hopefully, resolved.

No other tests were failing. The error output looked like:

 FAILED test/integration/proxy_test.py::test_connect_through_proxy[NO_CERT] - pyexasol.exceptions.ExaConnectionFailedError: 
(
   message     =>  Could not connect to Exasol: [Errno 111] Connection refused
   dsn         =>  localhost:8563
   user        =>  SYS
   schema      =>  
   session_id  =>  
)
FAILED test/integration/proxy_test.py::test_connect_through_proxy_with_authentication[NO_CERT] - pyexasol.exceptions.ExaConnectionFailedError: 
(
   message     =>  Could not connect to Exasol: [Errno 111] Connection refused
   dsn         =>  localhost:8563
   user        =>  SYS
   schema      =>  
   session_id  =>  
)
FAILED test/integration/proxy_test.py::test_connect_through_proxy_without_resolving_host_names - pyexasol.exceptions.ExaConnectionFailedError: 
(
   message     =>  Could not connect to Exasol: [Errno 111] Connection refused
   dsn         =>  localhost:8563
   user        =>  SYS
   schema      =>  
   session_id  =>  
)

To Dos

• Investigate what about websocket-client==1.9.0 leads to the proxy_test.py tests failing
• Resolve the issue
• Set the relevant line in the pyproject.toml to websocket-client = "^1.0.1"; thus, removing the down-pinning