Remove throws clause from DBOS.close (#368)

Author: devhawk

transact/src/main/java/dev/dbos/transact/DBOS.java

@@ -93,7 +93,7 @@ public DBOS(@NonNull DBOSConfig config) {
    * {@link #shutdown()}.
    */
   @Override
-  public void close() throws Exception {
+  public void close() {
     shutdown();
   }