Update to Bevy 0.13.0

[RPG-Alex]

The current project version of bevy is not the most currently available.

It would be good to do this on a testing branch first before switching the whole project to the newest version.

[Silzinc]

Here is a guide to do this:
https://bevyengine.org/learn/migration-guides/0-12-to-0-13/
It will actually be necessary for the Julia shader in progress to work. I will do it in the meantime.