bugfix: include delimiter in async ipc socket writes.

- ``AsyncIPCProvider`` should use a delimiter to separate
  messages when writing to the socket.

Author: fselmo

newsfragments/3537.bugfix.rst

@@ -0,0 +1 @@
+Include an end-of-line delimiter when writing to the socket with ``AsyncIPCProvider``.

web3/providers/persistent/async_ipc.py

@@ -116,7 +116,7 @@ async def socket_recv(self) -> RPCResponse:
 
     async def _socket_send(self, request_data: bytes) -> None:
         try:
-            self._writer.write(request_data)
+            self._writer.write(request_data + b"\n")
             await self._writer.drain()
         except OSError as e:
             # Broken pipe