Bump to Bevy 0.18, mark -dev1 prerelease

Bevy, Avian2d, and bevy_egui have all been bumped to the latest
versions.

MSRV is now Rust 1.89.0 because that's the minimum for Bevy (including a
couple of its dependencies).

Cargo.toml

@@ -1,14 +1,14 @@
 [package]
 name = "another-boids-in-rust"
-version = "0.9.0"
+version = "0.10.0-dev1"
 edition = "2024"
 license = "AGPL-3.0-only"
-rust-version = "1.88.0"
+rust-version = "1.89.0"
 
 [dependencies]
-avian2d = "0.4"
-bevy = "0.17.0"
-bevy-inspector-egui = "0.34"
+avian2d = "0.5"
+bevy = "0.18"
+bevy-inspector-egui = "0.36"
 
 [profile.dev]
 opt-level = 1