Use secure random

Author: adimiz1

core/src/main/java/com/cloudinary/android/DefaultRequestDispatcher.java

@@ -4,8 +4,8 @@
 
 import com.cloudinary.android.callback.ErrorInfo;
 
+import java.security.SecureRandom;
 import java.util.HashSet;
-import java.util.Random;
 import java.util.Set;
 
 /**
@@ -14,7 +14,7 @@
 class DefaultRequestDispatcher implements RequestDispatcher {
     private static final String TAG = DefaultRequestDispatcher.class.getSimpleName();
 
-    private final Random rand = new Random();
+    private final SecureRandom rand = new SecureRandom();
     private final BackgroundRequestStrategy strategy;
     private final ImmediateRequestsRunner immediateRequestsRunner;
     private final Set<String> abortedRequestIds = new HashSet<>();