Fix/SK-1259 | Use api/v1 for set_active_package in APIClient

[Wrede]

This pull request includes changes to the fedn/network/api/client.py file to improve the set_active_package method. The most important changes include modifying default parameter values and updating the URL endpoint used in the method.

Improvements to set_active_package method:

• Changed default values for name and description parameters from None to empty strings.
• Updated the URL endpoint from self._get_url("set_package") to self._get_url_api_v1("packages") for setting the package.