litellm - set 1.73.1 as minimum version (strands-agents#668)

Author: pgrayy

pyproject.toml

@@ -68,7 +68,7 @@ docs = [
     "sphinx-autodoc-typehints>=1.12.0,<2.0.0",
 ]
 litellm = [
-    "litellm>=1.72.6,<1.73.0",
+    "litellm>=1.73.1,<2.0.0",
 ]
 llamaapi = [
     "llama-api-client>=0.1.0,<1.0.0",