Update notify requirement from =5.0.0-pre.11 to =5.0.0-pre.15

Updates the requirements on [notify](https://github.com/notify-rs/notify) to permit the latest version.
- [Release notes](https://github.com/notify-rs/notify/releases)
- [Changelog](https://github.com/notify-rs/notify/blob/main/CHANGELOG.md)
- [Commits](notify-rs/notify@5.0.0-pre.11...5.0.0-pre.15)

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

Signed-off-by: dependabot[bot] <[email protected]>

crates/bevy_asset/Cargo.toml

@@ -30,7 +30,7 @@ anyhow = "1.0.4"
 thiserror = "1.0"
 downcast-rs = "1.2.0"
 fastrand = "1.7.0"
-notify = { version = "=5.0.0-pre.11", optional = true }
+notify = { version = "=5.0.0-pre.15", optional = true }
 parking_lot = "0.12.1"
 
 [target.'cfg(target_arch = "wasm32")'.dependencies]