fix(deps): update dependency openai to v1.91.0

Author: renovate[bot]

pyproject.toml

@@ -6,7 +6,7 @@ readme = "README.md"
 # renovate: datasource=python-version depName=python
 requires-python = ">=3.12, <3.14"
 dependencies = [
-  "openai==1.78.1",
+  "openai==1.91.0",
   "tiktoken<1.0.0,>=0.5.1",
   "tabulate>=0.9.0,<1.0.0",
   "codeowners<1.0.0,>=0.6.0",