chore(deps): bump litellm from 1.40.17 to 1.40.20 (#2576)

Bumps [litellm](https://github.com/BerriAI/litellm) from 1.40.17 to 1.40.20.
- [Release notes](https://github.com/BerriAI/litellm/releases)
- [Commits](https://github.com/BerriAI/litellm/compare/v1.40.17...v1.40.20)

---
updated-dependencies:
- dependency-name: litellm
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Graham Neubig <neubig@gmail.com>

poetry.lock

@@ -2771,13 +2771,13 @@ types-tqdm = "*"
 
 [[package]]
 name = "litellm"
-version = "1.40.17"
+version = "1.40.20"
 description = "Library to easily interface with LLM API providers"
 optional = false
 python-versions = "!=2.7.*,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,!=3.6.*,!=3.7.*,>=3.8"
 files = [
-    {file = "litellm-1.40.17-py3-none-any.whl", hash = "sha256:3501bab851a2bc7634a0c1675f3d4b5057d92d87f53cb67b2f59537b6f8e3b19"},
-    {file = "litellm-1.40.17.tar.gz", hash = "sha256:87aac43c3366059eff135ace60d1f1cea4eba3348da370cb0ae6db1215cbd970"},
+    {file = "litellm-1.40.20-py3-none-any.whl", hash = "sha256:6f142d69ac46450163a24d9d42cb949f72b1ffde4e074bb1d91b70d1e08b1045"},
+    {file = "litellm-1.40.20.tar.gz", hash = "sha256:7510116f2f9f833ffc6395f4840ff94e3ad84640a574cb62c7e64d69d0f0e20b"},
 ]
 
 [package.dependencies]