build(deps): update wayland-backend requirement from 0.1 to 0.3

Updates the requirements on [wayland-backend](https://github.com/smithay/wayland-rs) to permit the latest version.
- [Release notes](https://github.com/smithay/wayland-rs/releases)
- [Changelog](https://github.com/Smithay/wayland-rs/blob/master/historical_changelog.md)
- [Commits](Smithay/wayland-rs@wayland-backend-v0.1.1...wayland-backend-v0.3.2)

---
updated-dependencies:
- dependency-name: wayland-backend
  dependency-type: direct:production
...

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

Cargo.toml

@@ -43,7 +43,7 @@ tokio = { version = "1.21", features = [
 ], optional = true, default-features = false }
 tracing = { version = "0.1", optional = true }
 url = { version = "2.3", features = ["serde"] }
-wayland-backend = { version = "0.1", optional = true, features = [
+wayland-backend = { version = "0.3", optional = true, features = [
     "client_system",
 ] }
 wayland-client = { version = "0.30", optional = true }