Potential fix for code scanning alert no. 9: Binding a socket to all network interfaces

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

Author: gijzelaerr

snap7/s7commplus/server.py

@@ -258,7 +258,7 @@ def get_db(self, db_number: int) -> Optional[DataBlock]:
         """Get a registered data block."""
         return self._data_blocks.get(db_number)
 
-    def start(self, host: str = "0.0.0.0", port: int = 11020) -> None:
+    def start(self, host: str = "127.0.0.1", port: int = 11020) -> None:
         """Start the server.
 
         Args: