Update the bevy dependency to 0.15

[tropical32]

This PR updates dependencies to the latest versions:

• log: 0.4
• rand: 0.9
• bevy-inspector-gui: 0.29
• bevy: 0.15

Migration guide: https://bevyengine.org/learn/migration-guides/0-14-to-0-15/

[trunk-io]

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[zaycev]

Hey! Thanks for posting this, I will try to review it this week

[tigerplush]

Code looks good to me,
clippy warns:
warning: useless conversion to the same type: `bevy::prelude::Handle<bevy::prelude::Mesh>` --> src\gi\compositing.rs:213:16
warning: useless conversion to the same type: `bevy::prelude::Handle<bevy::prelude::Mesh>` --> src\gi\compositing.rs:235:16

clippy has no remarks except incorrect newline style, but that might be a windows issue

all examples work at good performance, only thing is:
at startup they all give a warning
WARN bevy_magic_light_2d::gi: Failed to get bind groups