Removes deprecated method access of LocatableRegistry and getPickBlock

src/main/java/appeng/core/features/registries/LocatableRegistry.java

@@ -63,6 +63,7 @@ public final class LocatableRegistry implements ILocatableRegistry
 	 * Find a locate-able object by its serial.
 	 */
 	@Override
+	@Deprecated
 	public Object findLocatableBySerial( long ser )
 	{
 		return this.set.get( ser );