Use node v. 20 instead of v. 16 to build the extension on GitHub CI

.github/workflows/update-vscode-extension.yml

@@ -20,7 +20,7 @@ jobs:
     - name: Setup the development environement
       uses: actions/setup-node@v3
       with:
-        node-version: "16"
+        node-version: "20"
 
     - name: Install all the dependencies
       run: yarn