Copybara import of the project:

--
cc4d06d by Jens Scheffler <jscheffl@apache.org>:

chore: Bump upper bound for litellm
COPYBARA_INTEGRATE_REVIEW=#6828 from jscheffl:bugfix/bump-upper-bound-litellm cc4d06d
PiperOrigin-RevId: 925546570

Author: jscheffl

setup.py

@@ -189,10 +189,9 @@
     "jsonschema",
     "ruamel.yaml",
     "pyyaml",
-    "litellm>=1.83.7, <1.83.15",
+    "litellm>=1.83.7, <1.86.0",
     # For LiteLLM tests. Lower bound: CVE-2026-35030 plus 4 follow-on
-    # advisories patched in 1.83.7. Upper bound <1.83.15 admits current
-    # latest (1.83.14).
+    # advisories patched in 1.83.7. Upper bound <1.86.0 for stable interface only.
 ]
 
 langchain_extra_require = [