fix(CertificateAuthority): set a 409 instead of 403 for bad ca deletions

A conflict error is a more accurate choice when someone tries to delete a CA that is currently in use.

Author: jaredhendrickson13

pfSense-pkg-RESTAPI/files/usr/local/pkg/RESTAPI/Models/CertificateAuthority.inc

@@ -8,6 +8,7 @@ use RESTAPI\Fields\BooleanField;
 use RESTAPI\Fields\IntegerField;
 use RESTAPI\Fields\StringField;
 use RESTAPI\Fields\UIDField;
+use RESTAPI\Responses\ConflictError;
 use RESTAPI\Responses\ForbiddenError;
 use RESTAPI\Responses\ValidationError;
 use RESTAPI\Validators\RegexValidator;
@@ -116,7 +117,7 @@ class CertificateAuthority extends Model {
     public function _delete(): void {
         # Do not allow this CertificateAuthority to be deleted if it is in use
         if (ca_in_use($this->refid->value)) {
-            throw new ForbiddenError(
+            throw new ConflictError(
                 message: 'Certificate authority cannot be deleted because it is in use.',
                 response_id: 'CERTIFICATE_AUTHORITY_CANNOT_BE_DELETED_WHILE_IN_USE',
             );