Bump headlessmc version to 2.9.0

Author: rubensworks

.github/workflows/deploy.yml

@@ -69,7 +69,7 @@ jobs:
       - name: Install Xvfb 🖥️
         run: sudo apt-get install -y xvfb
       - name: Generate icons 🎨
-        run: xvfb-run --auto-servernum --server-args="-screen 0 1920x1080x24" npm run generate:icons
+        run: xvfb-run --auto-servernum --server-args="-screen 0 1920x1080x24" npm run generate:icons --headlessmc-version 2.9.0
       - name: Generate HTML 📄
         run: npm run generate:html
       - name: Compress icons 🗜️