keycode is deprecated

[LucJager]

Hey,

In 23_day_event_listeners, the keycode must be replace by key or code because deprecated.

Sincerely,
LuCrypto

[asifurrahaman754]

I can work on this issue, please assign it to me.

[LucJager]

I'm not sure I have the rights to assign you :

[bensonOSei]

I have created a PR with a fix
#442