release(langgraph): 1.2.16 (#9334)

Bumps langgraph from 1.2.15 to 1.2.16.

Includes:

- Keep a DeltaChannel's value when its field changes to a plain reducer
(#9302)
- Save a resumed exit run's pending writes once (#9314)
- Stop a subgraph from rerunning its finished tasks on resume (#9315)
- Apply a resumed `Command`'s update once (#9322)
- Let other tasks finish when a resume value is invalid (#9265)

Author: eliornl

libs/langgraph/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "langgraph"
-version = "1.2.15"
+version = "1.2.16"
 description = "Building stateful, multi-actor applications with LLMs"
 authors = []
 requires-python = ">=3.10"