chore(deps): update rust crate heapless to 0.8.0

Author: renovate[bot]

crates/guest-rust/Cargo.toml

@@ -15,7 +15,7 @@ wasm-bindgen = "0.2.87"
 serde.workspace = true
 tracing = "0.1.37"
 postcard = { version = "1.0.7", features = ["alloc"]}
-heapless = "0.7.16"
+heapless = "0.8.0"
 js-sys = "0.3.64"
 thiserror.workspace = true