Update bevy requirement from 0.11 to 0.12

Updates the requirements on [bevy](https://github.com/bevyengine/bevy) to permit the latest version.
- [Release notes](https://github.com/bevyengine/bevy/releases)
- [Changelog](https://github.com/bevyengine/bevy/blob/main/CHANGELOG.md)
- [Commits](bevyengine/bevy@v0.11.0...v0.12.0)

---
updated-dependencies:
- dependency-name: bevy
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Cargo.toml

@@ -11,7 +11,7 @@ repository = "https://github.com/JonahPlusPlus/bevy_atmosphere"
 exclude = ["/assets/", "/examples/", "/.github/"]
 
 [dependencies]
-bevy = { version = "0.11", default-features = false, features = [
+bevy = { version = "0.12", default-features = false, features = [
  "bevy_asset",
  "bevy_render",
  "bevy_pbr",
@@ -21,7 +21,7 @@ cfg-if = "1.0"
 
 [dev-dependencies]
 bevy_spectator = "0.3"
-bevy = { version = "0.11", features = ["bevy_core_pipeline", "x11"] }
+bevy = { version = "0.12", features = ["bevy_core_pipeline", "x11"] }
 
 [features]
 default = ["basic", "all_models"]