release(prebuilt): 1.1.1 (#9316)

Bumps langgraph-prebuilt from 1.1.0 to 1.1.1.

Includes:

- Stop `ToolNode` from swallowing a resume value that fails an
interrupt's `response_schema` (#9232). This needs langgraph 1.2.15 or
later, which marks those errors; with an older langgraph, `ToolNode`
keeps today's behavior.
- Keep tool results out of v3 messages (#7838)

Managed Deep Agents (langchain-ai/managed-deepagents-sdk#710) will raise
its `langgraph-prebuilt` minimum to this release, so an invalid answer
to an interrupt raised inside a tool, such as a subagent, fails the
resume instead of reaching the model.

After merge, run the Release workflow with
`working-directory=libs/prebuilt`.

---

This PR was written with help from an AI coding agent (Claude Code); a
human reviewed and directed the changes.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

libs/langgraph/uv.lock

@@ -1835,7 +1835,7 @@ test = [
 
 [[package]]
 name = "langgraph-prebuilt"
-version = "1.1.0"
+version = "1.1.1"
 source = { editable = "../prebuilt" }
 dependencies = [
     { name = "langchain-core" },

libs/prebuilt/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "langgraph-prebuilt"
-version = "1.1.0"
+version = "1.1.1"
 description = "Library with high-level APIs for creating and executing LangGraph agents and tools."
 authors = []
 requires-python = ">=3.10"

libs/prebuilt/uv.lock

@@ -512,7 +512,7 @@ test = [
 
 [[package]]
 name = "langgraph-prebuilt"
-version = "1.1.0"
+version = "1.1.1"
 source = { editable = "." }
 dependencies = [
     { name = "langchain-core" },

libs/sdk-py/uv.lock

@@ -433,7 +433,7 @@ test = [
 
 [[package]]
 name = "langgraph-prebuilt"
-version = "1.1.0"
+version = "1.1.1"
 source = { editable = "../prebuilt" }
 dependencies = [
     { name = "langchain-core" },