chore(deps): update openai requirement in /libs/kotaemon

Updates the requirements on [openai](https://github.com/openai/openai-python) to permit the latest version.
- [Release notes](https://github.com/openai/openai-python/releases)
- [Changelog](https://github.com/openai/openai-python/blob/main/CHANGELOG.md)
- [Commits](openai/openai-python@v1.23.6...v2.6.1)

---
updated-dependencies:
- dependency-name: openai
  dependency-version: 2.6.1
  dependency-type: direct:production
...

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

Author: dependabot[bot]

libs/kotaemon/pyproject.toml

@@ -43,7 +43,7 @@ dependencies = [
     "chromadb<=1.2.2",
     "llama-index-vector-stores-chroma>=0.1.9",
     "llama-index-vector-stores-lancedb",
-    "openai>=1.23.6,<2",
+    "openai>=1.23.6,<3",
     "matplotlib",
     "matplotlib-inline",
     "openpyxl>=3.1.2,<3.2",