fix: add missing closing brace in unixTimestampFromDateBenchmark

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: andygrove

spark/src/test/scala/org/apache/spark/sql/benchmark/CometDatetimeExpressionBenchmark.scala

@@ -98,6 +98,7 @@ object CometDatetimeExpressionBenchmark extends CometBenchmarkBase {
           val name = s"Unix Timestamp from Date ($timeZone)"
           val query = "select unix_timestamp(dt) from parquetV1Table"
           runExpressionBenchmark(name, values, query)
+        }
       }
     }
   }