EXCH-13811 Remove unused import

Author: gmiedlar-ox

src/test/java/org/prebid/server/bidder/openx/OpenxBidderTest.java

@@ -2,7 +2,6 @@
 
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.JsonNode;
-import com.fasterxml.jackson.databind.node.JsonNodeFactory;
 import com.fasterxml.jackson.databind.node.ObjectNode;
 import com.iab.openrtb.request.Audio;
 import com.iab.openrtb.request.Banner;