release(checkpoint-postgres): 3.1.3 (#9287)

Version bump only. No library code changes in this PR.

Unreleased since `checkpointpostgres==3.1.2`:

- #8617 - widen `Store` `put` value type to `Mapping[str, Any]`
- #8556 - derive the delta walk cursor once the target loads
- #8544 - order delta channel replay by task path
- #9217 - validate namespace labels before store dispatch
- #9248 - start the delta walk at the target
- #9262 - treat an empty `checkpoint_id` as the latest in delta history

Follows `checkpoint==4.3.0`, which is already live on PyPI. #8544 raised
the floor to `langgraph-checkpoint>=4.3.0`, so this release needs it.

libs/checkpoint-postgres/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "langgraph-checkpoint-postgres"
-version = "3.1.2"
+version = "3.1.3"
 description = "Library with a Postgres implementation of LangGraph checkpoint saver."
 authors = []
 requires-python = ">=3.10"

libs/checkpoint-postgres/uv.lock

@@ -353,7 +353,7 @@ test = [
 
 [[package]]
 name = "langgraph-checkpoint-postgres"
-version = "3.1.2"
+version = "3.1.3"
 source = { editable = "." }
 dependencies = [
     { name = "langgraph-checkpoint" },

libs/langgraph/uv.lock

@@ -1685,7 +1685,7 @@ test = [
 
 [[package]]
 name = "langgraph-checkpoint-postgres"
-version = "3.1.2"
+version = "3.1.3"
 source = { editable = "../checkpoint-postgres" }
 dependencies = [
     { name = "langgraph-checkpoint" },

libs/prebuilt/uv.lock

@@ -418,7 +418,7 @@ test = [
 
 [[package]]
 name = "langgraph-checkpoint-postgres"
-version = "3.1.2"
+version = "3.1.3"
 source = { editable = "../checkpoint-postgres" }
 dependencies = [
     { name = "langgraph-checkpoint" },