adk-python v1.38.0: Safety settings, tool improvements, and dependency fixes

This release of google/adk-python v1.38.0 introduces enhanced safety setting propagation to the Live API and includes several bug fixes. Key improvements address security concerns in file reading tools and resolve dependency conflicts that impacted virtual environments. The updates aim to provide a more stable and secure development experience for users leveraging the Agent Development Kit.

• →forward safety_settings from generate_content_config to the Live API
• →avoid shell execution in ReadFileTool ranged reads and keep local environment file access in workspace
• →exclude nltk 3.10.1, which breaks venvs living inside the working directory (v1)
• →handle failed inference results without invocations (cherry-pick)
• →transfer to the target agent regardless of function response order