Add test of the version number on Anthropic provider

Problem/Motivation

The Anthropic provider module adds a date of the model release, since that is needed by Anthropic API to load the model. This is not available from the API so its been added as a config in the provider module. See https://docs.anthropic.com/en/api/complete for reference.

This means that if a model would be depracated, it would just stop working in the AI model.

Steps to reproduce

Proposed resolution

Add a test that would check that the current date in the provider module is still effective and working.

Remaining tasks

Check if Anthropic has free developer keys for such testing.

User interface changes

API changes

Data model changes