In manifest not added android.permission.READ_PHONE_STATE. permission.
Why error comes when I upload a new apk version error comes below.
Your app has an apk w
If you are using the package device_id to get the unique device id then that will add an android.permission.READ_PHONE_STATE without your knowledge which eventually will lead to the Play Store warning.
Instead you can use the device_info package for the same purpose without the need of the extra permission. Check this SO thread