How to migrate my flutter web app to the new Google Identity Services?

My flutter web app uses the 'google_sign_in' package to authenticate the users. I received an email telling me to migrate to the new Google Identity Services (GIS) before March 31, 2023. I could not find any information about how to migrate my flutter project. Will there be a new 'google_sign_in' package for GIS? Otherwise, what should I do? Thank you