Update litellm requirement from >=1.40.0 to >=1.106.2 (#4595)

Updates the requirements on [litellm](https://github.com/BerriAI/litellm) to permit the latest version.
- [Release notes](https://github.com/BerriAI/litellm/releases)
- [Commits](https://github.com/BerriAI/litellm/compare/litellm_1.81.13-dev...v1.106.2)

---
updated-dependencies:
- dependency-name: litellm
  dependency-version: 1.106.2
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -154,7 +154,7 @@ pluggy ~= 1.7
 # Uncapped: litellm now uses jsonschema<5.0,>=4.0.0, resolving earlier openapi-spec-validator conflict.
 # Note litellm >=1.83.11 does `from typing import NotRequired`, which is 3.11+ (PEP 655) - that is
 # why 3.10 support was dropped rather than pinning everyone to the last 3.10-compatible release.
-litellm>=1.40.0
+litellm>=1.106.2
 # Used today for LLMSettings (model/LLMSettings.py); transitively pulled by litellm but pinned explicitly
 # so the validation/typing layer doesn't disappear if litellm drops it.
 pydantic>=2.14.0,<3.0