ci: upgrade Node.js version to 20

Author: kuizuo

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest] # macos-latest, windows-latest
-        node: [18]
+        node: [20]
 
     steps:
       - uses: actions/checkout@v4