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As Salesforce suggested These guest user site profiles are associated to guest user licenses which give the ability to only read/create on standard objects and not update.
Is there any workaround to update Contact standard object from Salesforce Site?
A solution to this problem is to create a custom object with fields that map to fields on the standard object to be updated and give permission to the guest user to update this new object type. Include a reference to the standard object from this 'shadow' object to form a link between the custom and standard records. Create an insert/update trigger on both the custom and standard objects to keep the 2 in-sync so that when the custom is updated it updates the standard record to match.
You can do this in different ways but the most simple is using the keyword "Without Sharing" in the controller for that page.
public without sharing class yourcontroller {
//update logic here
}
You could try implementing via an @future method. From the guest site you'd pass your intended field values and contact record id to the @future method, where you would then instantiate a new contact sObject using the id you passed it, and then perform an update.
