To update Data Sensitivity Level for Salesforce uneditable Standard Fields, we have to set securityClassification through deployment.

1. Extract the Account Object BillingAddress field.

<?xml version="1.0" encoding="UTF-8"?>
<Package xmlns="http://soap.sforce.com/2006/04/metadata">
    <types>
        <members>Account.BillingAddress</members>
        <name>CustomField</name>
    </types>
	<version>59.0</version>
</Package>

2. Add securityClassification value to the extracted field and deploy the field.

<?xml version="1.0" encoding="UTF-8"?>
<CustomField xmlns="http://soap.sforce.com/2006/04/metadata">
    <fullName>BillingAddress</fullName>
    <trackFeedHistory>false</trackFeedHistory>
    <trackHistory>false</trackHistory>
    <securityClassification>Internal</securityClassification>
</CustomField>

To update Compliance Categorization for Salesforce uneditable Standard Fields, we have to set complianceGroup through deployment. 

How to update Compliance Categorization for Salesforce uneditable Standard Fields?

value to the extracted field and deploy the field.