feat: update safe sql characters

Author: eisbilir

src/main/java/com/topcoder/dal/util/QueryHelper.java

@@ -200,7 +200,8 @@ public static String sanitizeSQLStatement(String sql) {
         StringBuilder safeSQL = new StringBuilder();
         for (char c : sql.toCharArray()) {
             if (Character.isLetterOrDigit(c) || c == ' ' || c == ',' || c == '(' || c == ')' || c == '=' || c == '<'
-                    || c == '>' || c == '_' || c == ':' || c == '.' || c == '-' || c == '+' || c == '*' || c == '\'') {
+                    || c == '>' || c == '_' || c == ':' || c == '.' || c == '-' || c == '+' || c == '*' || c == '\''
+                    || c == '!') {
                 safeSQL.append(c);
             }
         }