datasource_connections_update.xml

<?xml version="1.0" encoding="UTF-8"?>
<tsResponse xmlns="http://tableau.com/api"
            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
            xsi:schemaLocation="http://tableau.com/api https://help.tableau.com/samples/en-us/rest_api/ts-api_3_25.xsd">
    <connections>
        <connection id="be786ae0-d2bf-4a4b-9b34-e2de8d2d4488"
                    type="sqlserver"
                    serverAddress="updated-server"
                    serverPort="1433"
                    userName="user1"
                    embedPassword="true"
                    authenticationType="auth-keypair" />
        <connection id="a1b2c3d4-e5f6-7a8b-9c0d-123456789abc"
                    type="sqlserver"
                    serverAddress="updated-server"
                    serverPort="1433"
                    userName="user1"
                    embedPassword="true"
                    authenticationType="auth-keypair" />
    </connections>
</tsResponse>