fix: use wasm32v1-none target in getting-started.sh script

The wasm32-unknown-unknown target combined with the serde_core fork
causes duplicate lang item errors. Using wasm32v1-none avoids the
-Z build-std fallback that triggers the conflict.

scripts/getting-started.sh

@@ -149,7 +149,7 @@ if prompt_default_yes "\n🦀 Setup the Rust environment (e.g. WASM support)?";
     printf "🦀 Setting up Rust environment.\n"
     rustup default stable
     rustup update
-    rustup target add wasm32-unknown-unknown
+    rustup target add wasm32v1-none
     rustup component add rust-src
 fi