mistral: fix of issue #26029 (#28233)
- Description: Azure AI takes an issue with the safe_mode parameter
being set to False instead of None. Therefore, this PR changes the
default value of safe_mode from False to None. This results in it being
filtered out before the request is sent - avoind the extra-parameter
issue described below.
- Issue: #26029
- Dependencies: /
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Co-authored-by: blaufink <sebastian.brueckner@outlook.de>
Co-authored-by: Erick Friis <erick@langchain.dev>
