Upgrade Braintree SDK to v.4.17.1 or higher

[bsenyk]

According to communications from Paypal, they may stop supporting the version currently used here at the end of February:

A new version of the SDK was released on October 14, 2022, with new security enhancements. Please upgrade to the Braintree Python SDK v.4.17.1 or higher as soon as possible. Starting February 28, 2023, older versions of the SDK may no longer be supported.

To make this update:
If you're currently using v4 of the Python SDK, you need to upgrade the SDK to v4.17.1 or higher. Your integration will not require any other changes.
If you're currently using v3 or lower of the Braintree Python SDK, please upgrade to Braintree Python SDK v3.59.1. You also should plan to upgrade to v4.17.1 or higher in the near future. See our migration guide for details on necessary integration changes.
Should this remediation require an update to your integration, you may need to engage a developer or speak to your shopping cart or third-party provider.

For any questions, please don’t hesitate to contact Braintree Support for assistance.