Increased ARBITRARY_REQUEST_TIMEOUT from 10 to 12 seconds, as some were coming back around 9-10 seconds later.

src/main/java/org/qortal/controller/arbitrary/ArbitraryDataManager.java

@@ -38,7 +38,7 @@ public class ArbitraryDataManager extends Thread {
 	private int powDifficulty = 14; // Must not be final, as unit tests need to reduce this value
 
 	/** Request timeout when transferring arbitrary data */
-	public static final long ARBITRARY_REQUEST_TIMEOUT = 10 * 1000L; // ms
+	public static final long ARBITRARY_REQUEST_TIMEOUT = 12 * 1000L; // ms
 
 	/** Maximum time to hold information about an in-progress relay */
 	public static final long ARBITRARY_RELAY_TIMEOUT = 60 * 1000L; // ms