Update needed: Responsible AI models use now-deprecated models (and top_k parameter)

The examples in the responsible_ai/ directory (guardrails) use Claude 3 Sonnet, which is now deprecated. The models and text references to them need to be updates. Also the invocations need to be modified to remove the top_k parameter because newer Claude models will not accept both temperature and top_k.

Start in the responsible_ai/ directory by searching the guardrails examples for Claude 3 Sonnet, its text references, and top_k in model invocations. Update the affected model references and invocations, then run the examples to confirm they use supported Claude models without the incompatible parameter combination.

Written by the indexing model from the issue text.