fix: change to mounts (#622)

Author: jonthemango

src/keycloak/connection.py

@@ -102,7 +102,7 @@ def __init__(
         if proxies:
             self._s.proxies.update(proxies)
 
-        self.async_s = httpx.AsyncClient(verify=verify, proxies=proxies, cert=cert)
+        self.async_s = httpx.AsyncClient(verify=verify, mounts=proxies, cert=cert)
         self.async_s.auth = None  # don't let requests add auth headers
         self.async_s.transport = httpx.AsyncHTTPTransport(retries=1)