CONJ-873 - race condition correction on empty getGeneratedKeys metadata

When command return no getGeneratedKeys driver return an empty static resultset.
Problem is that when using Resultset.metadata, the shared buffer position can changed if used simultaneously, resulting with those errors

src/main/java/org/mariadb/jdbc/internal/com/read/resultset/SelectResultSet.java

@@ -68,15 +68,9 @@ public class SelectResultSet implements ResultSet {
   public static final int YEAR_IS_DATE_TYPE = 2;
   private static final String NOT_UPDATABLE_ERROR =
       "Updates are not supported when using ResultSet.CONCUR_READ_ONLY";
-  private static final ColumnDefinition[] INSERT_ID_COLUMNS;
 
   private static final int MAX_ARRAY_SIZE = Integer.MAX_VALUE - 8;
 
-  static {
-    INSERT_ID_COLUMNS = new ColumnDefinition[1];
-    INSERT_ID_COLUMNS[0] = ColumnDefinition.create("insert_id", ColumnType.BIGINT);
-  }
-
   protected TimeZone timeZone;
   protected Options options;
   protected ColumnDefinition[] columnsInformation;
@@ -274,6 +268,8 @@ public static ResultSet createResultSet(
   }
 
   public static SelectResultSet createEmptyResultSet() {
+    ColumnDefinition[] INSERT_ID_COLUMNS = new ColumnDefinition[1];
+    INSERT_ID_COLUMNS[0] = ColumnDefinition.create("insert_id", ColumnType.BIGINT);
     return new SelectResultSet(INSERT_ID_COLUMNS, new ArrayList<>(), null, TYPE_SCROLL_SENSITIVE);
   }