wasi => wasip1

the target name changed, see
<https://doc.rust-lang.org/rustc/platform-support/wasm32-wasip1.html>

Author: Ariel Ben-Yehuda

.github/workflows/ci.yml

@@ -30,7 +30,7 @@ jobs:
             target: wasm32-unknown-unknown
           - rust: nightly
             name: WASI
-            target: wasm32-wasi
+            target: wasm32-wasip1
           - rust: stable
             name: Windows
             os: windows