ci(workflow): 将Rust工具链从stable切换为nightly

为了支持wasm32-wasip2目标，需要nightly版本的Rust工具链

Author: oovm

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ jobs:
 
       # Setup Rust
       - name: Install Rust
-        uses: dtolnay/rust-toolchain@stable
+        uses: dtolnay/rust-toolchain@nightly
         with:
           components: rustfmt, clippy
 
@@ -56,7 +56,7 @@ jobs:
 
       # Setup Rust
       - name: Install Rust
-        uses: dtolnay/rust-toolchain@stable
+        uses: dtolnay/rust-toolchain@nightly
         with:
           targets: wasm32-wasip2