ServiceStack, including packages such as ServiceStack.Redis, are becoming commercially supported products in version 4. You probably have been using version 3.x of the ServiceStack packages, and NuGet decided to update you to 4.x.
There are limits for free usage of the v4 libraries. See this announcement for more info. Version 3.x of all ServiceStack products remain open-source; there is a new GitHub project with information about v3 support.
For now, I would suggest undoing the package update and setting the max version to 3.x in your NuGet package config file, so that your NuGet packages remain at version 3.x for production code in the short term:
<package id="ServiceStack.Xyz" version="3.x.x" allowedVersions="[3,4)" />
Then it should be safe to use NuGet to update your packages.
Meanwhile, you can visit https://servicestack.net to evaluate your options for upgrading to version 4, licensing choices, or whether to stick with v3.