Update src/fastmcp/utilities/http.py

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

src/fastmcp/utilities/http.py

@@ -3,6 +3,6 @@ import socket
 
 def find_available_port() -> int:
     """Find an available port by letting the OS assign one."""
-    with socket.socket() as s:
+    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
         s.bind(("127.0.0.1", 0))
         return s.getsockname()[1]