fix: use node 20 for win-arm64 build

Node 18 has no official Windows ARM64 builds for setup-node.

Author: andiradulescu

.github/workflows/test-win-arm64.yml

@@ -16,7 +16,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: 18
+          node-version: 20
           cache: npm
 
       - name: Install dependencies