chore(deps): remove unused litellm dep (ogx-ai#5813)

Author: mattf

pyproject.toml

@@ -14,7 +14,6 @@ constraint-dependencies = [
     "fonttools>=4.60.2",
     "gitpython>=3.1.47",               # Command injection via Git options bypass
     "h11>=0.16.0",
-    "litellm<1.83.7",                   # >=1.83.7 pins pydantic==2.12.5 which breaks int coercion in openai model recordings
     "pydantic>=2.11.9,<2.12.0",        # 2.12 breaks int coercion in openai.types.model.Model during test replay
     "lxml>=6.1.0",                     # CVE-2026-41066: XML entity expansion with default resolve_entities=True
     "pillow>=12.2.0",                  # CVE-2026-40192 + 4 more: heap overflow, OOB write, DoS
@@ -210,7 +209,6 @@ unit = [
     "sqlalchemy[asyncio]>=2.0.41",
     "blobfile",
     "faiss-cpu",
-    "litellm",
     "together",
     "coverage",
     "moto[s3]>=5.1.10",