fix(connection): Ensure we have an initialized protocol in connection (#3981)

Author: Medno

redis/asyncio/connection.py

@@ -248,7 +248,7 @@ def __init__(
         else:
             if p < 2 or p > 3:
                 raise ConnectionError("protocol must be either 2 or 3")
-            self.protocol = p
+        self.protocol = p
 
     def __del__(self, _warnings: Any = warnings):
         # For some reason, the individual streams don't get properly garbage

redis/connection.py

@@ -884,8 +884,7 @@ def __init__(
         else:
             if p < 2 or p > 3:
                 raise ConnectionError("protocol must be either 2 or 3")
-                # p = DEFAULT_RESP_VERSION
-            self.protocol = p
+        self.protocol = p
         if self.protocol == 3 and parser_class == _RESP2Parser:
             # If the protocol is 3 but the parser is RESP2, change it to RESP3
             # This is needed because the parser might be set before the protocol