chore: Upgrade Node.js version in CI workflow to 20

### Summary of Changes
- Updated the Node.js version from `18` to `20` in the CI workflow configuration.

### Expected Results
- Ensured compatibility with the latest Node.js features and improvements, enhancing the overall CI process.

.gitea/workflows/ci.yml

@@ -210,10 +210,10 @@ jobs:
     - name: Checkout code
       uses: actions/checkout@v4
       
-    - name: Set up Node.js 18
+    - name: Set up Node.js 20
       uses: actions/setup-node@v4
       with:
-        node-version: '18'
+        node-version: '20'
         
     - name: Cache npm dependencies
       uses: actions/cache@v4