chore(deps): update transformers requirement in /api in the llm group

Updates the requirements on [transformers](https://github.com/huggingface/transformers) to permit the latest version.

Updates `transformers` to 5.4.0
- [Release notes](https://github.com/huggingface/transformers/releases)
- [Commits](https://github.com/huggingface/transformers/compare/v5.3.0...v5.4.0)

---
updated-dependencies:
- dependency-name: transformers
  dependency-version: 5.4.0
  dependency-type: direct:production
  dependency-group: llm
...

Signed-off-by: dependabot[bot] <support@github.com>

api/pyproject.toml

@@ -76,7 +76,7 @@ dependencies = [
     "sqlalchemy~=2.0.29",
     "starlette==1.0.0",
     "tiktoken~=0.12.0",
-    "transformers~=5.3.0",
+    "transformers~=5.4.0",
     "unstructured[docx,epub,md,ppt,pptx]~=0.21.5",
     "pypandoc~=1.13",
     "yarl~=1.23.0",