Fix CI for Rust test

.github/workflows/ci.yml

@@ -27,6 +27,11 @@ jobs:
           node-version: ${{ matrix.node }}
           registry-url: "https://registry.npmjs.org"
 
+      - name: Install 1.70.x Rust toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+            toolchain: 1.70
+
       - name: Install
         if: ${{ matrix.flavor == 'dev'}}
         run: npm ci