chore(dependencies): update litellm version constraint to allow minor updates

Author: Davidson Gomes

pyproject.toml

@@ -30,7 +30,7 @@ dependencies = [
     "google-cloud-aiplatform==1.90.0",
     "python-dotenv==1.1.0",
     "google-adk==0.3.0",
-    "litellm==1.68.1",
+    "litellm>=1.68.0,<1.69.0",
     "python-multipart==0.0.20",
     "alembic==1.15.2",
     "asyncpg==0.30.0",