Return copy-backed Binary from Int96Generator.nextValue

Pre-PR, Int96Generator.nextBinaryValue went through
FixedBinaryTestUtils.getFixedBinary which returned a constant-backed
Binary. The refactor switched to Binary.fromReusedByteArray over the
shared scratch buffer, so successive nextValue() calls mutate Binaries
returned by earlier calls -- breaking any caller that retains results
(e.g. RandomValues.wrapSorted).

Author: rahulketch

parquet-hadoop/src/test/java/org/apache/parquet/statistics/RandomValues.java

@@ -23,6 +23,7 @@
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Comparator;
 import java.util.Iterator;
 import java.util.List;
@@ -236,7 +237,7 @@ public Binary nextValue() {
           .putLong(timeOfDay)
           .putInt(julianDay);
 
-      return Binary.fromReusedByteArray(buffer, 0, INT_96_LENGTH);
+      return Binary.fromConstantByteArray(Arrays.copyOf(buffer, INT_96_LENGTH));
     }
 
     @Override