fix(ci): align workflow Node.js version with package engines (#520)

Co-authored-by: Cursor <cursoragent@cursor.com>

.github/workflows/flathub.yml

@@ -35,7 +35,7 @@ jobs:
       - name: Set up Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: "22"
+          node-version: "24"
 
       - name: Install source generators
         run: |