Moved self._lock initialisation to Pool constructor

Author: vladvildanov

redis/connection.py

@@ -1378,6 +1378,7 @@ def __init__(
         # will notice the first thread already did the work and simply
         # release the lock.
         self._fork_lock = threading.Lock()
+        self._lock = threading.Lock()
         self.reset()
 
     def __repr__(self) -> (str, str):
@@ -1395,7 +1396,6 @@ def get_protocol(self):
         return self.connection_kwargs.get("protocol", None)
 
     def reset(self) -> None:
-        self._lock = threading.Lock()
         self._created_connections = 0
         self._available_connections = []
         self._in_use_connections = set()