Use platform protocol for BLE example (#925)

This permits to meaningfully run it in release mode.

Author: ia0

examples/rust/nordic_ble_adv/Cargo.lock

@@ -8,7 +8,6 @@ edition = "2024"
 [dependencies]
 ble-adv = { path = "../../../crates/runner-nordic/crates/ble-adv" }
 bytemuck = { version = "1.23.2", default-features = false }
-data-encoding = { version = "2.9.0", default-features = false, features = ["alloc"] }
 wasefire = { path = "../../../crates/prelude" }
 
 [lints]