Update expected fingerprint after ObjectId implementation changes

MongoDB's ObjectId hash code implementation changed, so we have to
update the expected fingerprint.

See: mongodb/mongo-java-driver#1582

Author: bernd

graylog2-server/src/test/java/org/graylog2/streams/StreamListFingerprintTest.java

@@ -102,7 +102,7 @@ public void testGetFingerprint() throws Exception {
 
         // The fingerprint depends on the hashCode of each stream and stream rule and might change if the underlying
         // implementation changed.
-        assertEquals("dc859599e0c4564322fbb7535796e96147ad766b", fingerprint.getFingerprint());
+        assertEquals("d669c1037a49c956ef8f25033abc065c2fb259d4", fingerprint.getFingerprint());
     }
 
     @Test