Update placeholder for password field

ee/app/assets/javascripts/security_configuration/dast_site_profiles_form/components/dast_site_auth_section.vue

 <script>
 import { GlFormGroup, GlFormInput, GlFormCheckbox } from '@gitlab/ui';
 import { initFormField } from 'ee/security_configuration/utils';
-import { __ } from '~/locale';
 import validation from '~/vue_shared/directives/validation';
 export default {
@@ -60,8 +59,8 @@ export default {
     showValidationOrInEditMode() {
       return this.showValidation || this.isEditMode;
     },
-    sensitiveFieldPlaceholder() {
-      return this.isEditMode ? __('[Unchanged]') : '';
+    passwordFieldPlaceholder() {
+      return this.isEditMode ? '••••••••' : '';
     },
   },
   watch: {
@@ -126,7 +125,7 @@ export default {
             autocomplete="off"
             name="password"
             type="password"
-            :placeholder="sensitiveFieldPlaceholder"
+            :placeholder="passwordFieldPlaceholder"
             :required="isSensitiveFieldRequired"
             :state="form.fields.password.state"
           />