Splitting otmetrics fix from #379 (#396)

* Splitting otmetrics close stmt from #379

* Add CONTRIBUTORS for traceable copyright attribution

---------

Co-authored-by: Brian Kroth <bpkroth@users.noreply.github.com>

Author: ngbanguyen

CONTRIBUTORS.md

@@ -19,4 +19,5 @@
 We also acknowledge contributions from the following collaborators:
 
 + [Florian Funke](http://www3.in.tum.de/~funkef/)
-+ [Michael Seibold](http://www3.in.tum.de/~seibold/)
++ [Michael Seibold](http://www3.in.tum.de/~seibold/)
++ [Oracle](https://github.com/oracle) (Copyright (c) 2023, Oracle and/or its affiliates.)

src/main/java/com/oltpbenchmark/benchmarks/otmetrics/procedures/GetSessionRange.java

@@ -70,6 +70,8 @@ public List<Object[]> run(Connection conn, int source_id, int session_low, int s
                 finalResults.add(arr);
             }
         }
+	    stmt.close();
+
         return (finalResults);
     }