ENGCOM-7856: Resolve Field 'Number of Symbols' in CAPTCHA settings has missing range validation #29199

 - Merge Pull Request #29199 from edenduong/magento2:2.4-bugfix/validate_symbol_length_issue29198
 - Merged commits:
   1. 8176ad5
   2. 0d94aba

Author: magento-engcom-team

app/code/Magento/Captcha/etc/adminhtml/system.xml

@@ -57,7 +57,7 @@
                     <depends>
                         <field id="enable">1</field>
                     </depends>
-                    <frontend_class>required-entry</frontend_class>
+                    <frontend_class>required-entry validate-range range-1-8</frontend_class>
                 </field>
                 <field id="symbols" translate="label comment" type="text" sortOrder="8" showInDefault="1" canRestore="1">
                     <label>Symbols Used in CAPTCHA</label>