core: Add ruff rules for PIE (#26939)

All auto-fixes.

libs/core/langchain_core/runnables/config.py

@@ -36,8 +36,6 @@ else:
 class EmptyDict(TypedDict, total=False):
     """Empty dict type."""
 
-    pass
-
 
 class RunnableConfig(TypedDict, total=False):
     """Configuration for a Runnable."""

libs/core/langchain_core/runnables/configurable.py

@@ -457,8 +457,6 @@ RunnableConfigurableFields.model_rebuild()
 class StrEnum(str, enum.Enum):
     """String enum."""
 
-    pass
-
 
 _enums_for_spec: WeakValueDictionary[
     Union[

libs/core/langchain_core/runnables/fallbacks.py

@@ -619,7 +619,8 @@ class RunnableWithFallbacks(RunnableSerializable[Input, Output]):
                 return self.__class__(
                     **{
                         **self.model_dump(),
-                        **{"runnable": new_runnable, "fallbacks": new_fallbacks},
+                        "runnable": new_runnable,
+                        "fallbacks": new_fallbacks,
                     }
                 )