Great question! Basic auth to obtain a bearer token via the /v1/auth/token endpoint in the Jamf Pro API is not being removed. The scope of change for removal of basic auth is limited to the Classic API.
An easy way to identify whether you're using the Classic API or Jamf Pro API is to look at the base path of your URI. If it includes "JSSResource", you're using the Classic API and these changes impact you. If it includes "api" or "uapi" (uapi has been deprecated), you're using the Jamf Pro API and the changes to basic auth do not impact you.