GLTFLoader: Remove deprecated code. (#29502)

Author: Mugen87

examples/jsm/loaders/GLTFLoader.js

@@ -267,16 +267,6 @@ class GLTFLoader extends Loader {
 
 	}
 
-	setDDSLoader() {
-
-		throw new Error(
-
-			'THREE.GLTFLoader: "MSFT_texture_dds" no longer supported. Please update to "KHR_texture_basisu".'
-
-		);
-
-	}
-
 	setKTX2Loader( ktx2Loader ) {
 
 		this.ktx2Loader = ktx2Loader;