Update egui-toast requirement from 0.14 to 0.15

Updates the requirements on [egui-toast](https://github.com/urholaukkarinen/egui-toast) to permit the latest version.
- [Commits](urholaukkarinen/egui-toast@0.14.0...0.15.0)

---
updated-dependencies:
- dependency-name: egui-toast
  dependency-type: direct:production
...

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

anise-gui/Cargo.toml

@@ -14,7 +14,7 @@ hifitime = { workspace = true }
 log = { workspace = true }
 bytes = { workspace = true }
 pretty_env_logger = { workspace = true }
-egui-toast = "0.14"
+egui-toast = "0.15"
 eframe = { version = "0.28" }
 egui = { version = "0.28" }
 egui_extras = { version = "0.28", features = ["datepicker", "http", "image"] }