temp fix for trailing slash on redirects

Issue in SilverStripe Framework 5.1.12 will add a trailing slash to the redirect URL
see: silverstripe/silverstripe-framework#11151

src/Control/Controller.php

@@ -128,6 +128,22 @@ public function authenticate(HTTPRequest $request)
         return $this->redirect($url);
     }
 
+    /**
+     * Issue in SilverStripe Framework 5.1.12 will add a trailing slash to the redirect URL
+     * see: https://github.com/silverstripe/silverstripe-framework/issues/11151
+     * This method is a workaround for this issue
+     *
+     * @param string $url
+     * @param int $code
+     * @return HTTPResponse
+     */
+    public function redirect(string $url, int $code = 302): HTTPResponse
+    {
+        $response = new HTTPResponse();
+        return $response->redirect($url, $code);
+    }
+
+
     /**
      * The return endpoint after the user has authenticated with a provider
      *