chore(tests): suppress trustcall deprecation warning

Add pytest filter to suppress LangGraphDeprecatedSinceV10 warning from
trustcall library (a dependency of langmem). The warning is about trustcall
using deprecated 'from langgraph.constants import Send' instead of
'from langgraph.types import Send'. This is an issue in their library,
not ours.

Author: bsbodden

pyproject.toml

@@ -59,6 +59,8 @@ filterwarnings = [
     # Ignore testcontainers internal deprecation warnings (they haven't fixed their own code yet)
     "ignore::DeprecationWarning:testcontainers.core.waiting_utils",
     "ignore::DeprecationWarning:testcontainers.redis",
+    # Ignore trustcall library's deprecated import (used by langmem)
+    "ignore:Importing Send from langgraph.constants is deprecated.*:langgraph.errors.LangGraphDeprecatedSinceV10:trustcall._base",
 ]
 
 [tool.poetry.scripts]