never code on days with to less sleep, fix mod of immutable tuple in unittest

Author: brainelectronics

tests/test_tcp_example.py

@@ -544,7 +544,7 @@ def test_read_input_registers_single(self) -> None:
 
         # due to value increment by registered callback in
         # tcp_client_example.py, see #31 and #51
-        expectation[0] += 1
+        expectation = (expectation[0] + 1, )
 
         register_value = self._host.read_input_registers(
             slave_addr=self._client_addr,