[py] Fix proxy basic auth handling special characters

Author: cgoldberg

py/selenium/webdriver/remote/remote_connection.py

@@ -22,7 +22,7 @@
 from base64 import b64encode
 from typing import Optional
 from urllib import parse
-from urllib.parse import urlparse
+from urllib.parse import unquote, urlparse
 
 import urllib3
 
@@ -298,7 +298,9 @@ def _get_connection_manager(self):
                 return SOCKSProxyManager(self._proxy_url, **pool_manager_init_args)
             if self._identify_http_proxy_auth():
                 self._proxy_url, self._basic_proxy_auth = self._separate_http_proxy_auth()
-                pool_manager_init_args["proxy_headers"] = urllib3.make_headers(proxy_basic_auth=self._basic_proxy_auth)
+                pool_manager_init_args["proxy_headers"] = urllib3.make_headers(
+                    proxy_basic_auth=unquote(self._basic_proxy_auth)
+                )
             return urllib3.ProxyManager(self._proxy_url, **pool_manager_init_args)
 
         return urllib3.PoolManager(**pool_manager_init_args)