[libgdx] Fix example, prepare for Maven release

spine-libgdx/build.gradle

@@ -1,8 +1,8 @@
 group = "com.esotericsoftware.spine"
-version = "4.1.0"
+version = "4.2.0"
 
 ext {
-    libgdxVersion = "1.11.1-SNAPSHOT"
+    libgdxVersion = "1.12.1"
     javaVersion = 8
 }
 

spine-libgdx/spine-libgdx-tests/src/com/esotericsoftware/spine/PhysicsTest.java

@@ -69,7 +69,7 @@ public class PhysicsTest extends ApplicationAdapter {
 
 		AnimationStateData stateData = new AnimationStateData(skeletonData); // Defines mixing (crossfading) between animations.
 		state = new AnimationState(stateData); // Holds the animation state for a skeleton (current animation, time, etc).
-		state.setAnimation(0, "FOA", true);
+		state.setAnimation(0, "walk", true);
 	}
 
 	public void render () {