fix: set psalm var type for linter

Author: ricklambrechts

src/Services/ExceptionHandler.php

@@ -103,6 +103,8 @@ protected function default400Response(OpenIDConnectClientException $exception):
 
     protected function getRequest(): ?Request
     {
-        return request();
+        /** @psalm-var Request $request */
+        $request = request();
+        return $request;
     }
 }