release(cli): 0.4.38 (#9411)

Bumps the CLI to 0.4.38 to cut a release including #9393 (the `priority`
section in `langgraph.json`), the only CLI change merged since 0.4.37.
The section takes effect with `langgraph-api` 0.18.0 or later; older
servers ignore it, and configs without it build the same images as
before.

Merging doesn't publish by itself: after it merges, run the `release`
workflow with `working-directory: libs/cli`.

libs/cli/langgraph_cli/__init__.py

@@ -1 +1 @@
-__version__ = "0.4.37"
+__version__ = "0.4.38"

libs/sdk-py/langgraph_sdk/__init__.py

@@ -5,7 +5,7 @@ from langgraph_sdk.encryption.types import DecryptResult, EncryptionContext
 from langgraph_sdk.priority import Priority
 from langgraph_sdk.priority.types import PriorityContext, PrioritySettings
 
-__version__ = "0.4.8"
+__version__ = "0.4.9"
 
 __all__ = [
     "Auth",