Improve the notification sound (#8155)

The old sound doesn't fit the role of a notification very well.

The current sound is more befitting to the objective of notify the user
and brings a simple and modern semblance to the project.

Signed-off-by: Renan Andrade Torrente <renan.torrente@hotmail.com>
Signed-off-by: Igor Matheus Andrade Torrente <igormtorrente@gmail.com>