Not working beacuse when you are downlaoding the dependency then there will error showing like some security for dependency manager composer require google/apiclient:^2.0 this we will user so after running this the securty error will be showing so because of this the dependency is not downlaod properly so to fix this you will to update your composer.json file present in root directly of the file update

"require": { "google/apiclient": "^2.0", "firebase/php-jwt": "^6.0" }

it will look like this composer.json will look like this

and this run the command composer update after completing that you google login will be working fine