ci: upgrade to node 20.x

Author: avivace

.github/workflows/deploy.yml

@@ -16,7 +16,7 @@ jobs:
     - name: Install NodeJS
       uses: actions/setup-node@v4
       with:
-        node-version: '16.x'
+        node-version: '20.x'
         cache: yarn
         cache-dependency-path: gbdevio/yarn.lock