Fix python linter

Signed-off-by: Irene Bandera <irenebandera@eprosima.com>

Author: irenebm

py_utils/py_utils/system/system_utils.py

@@ -18,6 +18,7 @@
 
 import os
 
+
 def is_linux() -> bool:
     """
     @brief Check if the script is running in a Linux environment.
@@ -26,6 +27,7 @@ def is_linux() -> bool:
     """
     return os.name == 'posix'
 
+
 def is_windows() -> bool:
     """
     @brief Check if the script is running in a Windows environment.