build(deps): update iced requirement from 0.10 to 0.12 in /demo

Updates the requirements on [iced](https://github.com/iced-rs/iced) to permit the latest version.
- [Release notes](https://github.com/iced-rs/iced/releases)
- [Changelog](https://github.com/iced-rs/iced/blob/master/CHANGELOG.md)
- [Commits](iced-rs/iced@0.10.0...0.12.1)

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

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

Author: dependabot[bot]

demo/Cargo.toml

@@ -19,7 +19,7 @@ default-model-ll = ["deep_filter/default-model-ll"]
 thresholds = []
 
 [dependencies]
-iced = { version = "0.10", features = [
+iced = { version = "0.12", features = [
   "image",
   "debug",
   "tokio",