demo: Update to three.js r111

Cloudflare has r109 as the latest version, so switch to jsdelivr.

Author: zeux

demo/index.html

@@ -30,7 +30,7 @@
 		<a href="https://github.com/zeux/meshoptimizer" target="_blank" rel="noopener">meshoptimizer</a>
 		</div>
 
-		<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/109/three.min.js"></script>
+		<script src="https://cdn.jsdelivr.net/npm/three@v0.111.0/build/three.min.js"></script>
 
 		<script src="../js/meshopt_decoder.js"></script>
 		<script src="GLTFLoader.js"></script>