adsGetNetIdForPLC: Solve too small buffer size for build 4026+

Some PLCs that run TwinCAT >4026 send more bytes than expected when requesting the AMS NetID. This patch allocates more buffer size to the response to solve an error where the function would error out for no appearant reason.

pyads/pyads_ex.py

@@ -394,8 +394,10 @@ def adsGetNetIdForPLC(ip_address: str) -> str:
     data_header += struct.pack(">4s", b"\x00\x00\x00\x00")  # Block of unknown
 
     data, addr = send_raw_udp_message(
-        ip_address, data_header, 395
-    )  # PLC response is 395 bytes long
+        ip_address, data_header, 398
+    )
+    # PLC response should be 395 bytes long, but some PLCs running build 4026+
+    # respond with more bytes, so this takes care of that
 
     rcvd_packet_header = data[
         0:12