langchain: cherry-pick moderation fix into v0.1 (#21544)
```
git checkout v0.1
git pull
git checkout -b cc/cherry_pick_into_v01
git cherry-pick d3ca2cc8c3488eb973dd5ee3ebd4a8d10d8e2dbf
```
Co-authored-by: Matt Florence <matt@mattflo.com>
Co-authored-by: Emilia Katari <emilia@outpace.com>
Co-authored-by: Erick Friis <erickfriis@gmail.com>
Co-authored-by: Erick Friis <erick@langchain.dev>
