[dependencies] Update datasets pin (#39500)

* pyarrow pin

* make fixup

* test?

* like this?

* like this?

* like this?

* datasets pin

* comment

.github/workflows/build_documentation.yml

@@ -18,6 +18,10 @@ jobs:
       notebook_folder: transformers_doc
       languages: ar de en es fr hi it ko pt tr zh ja te
       custom_container: huggingface/transformers-doc-builder
+      # Temporary pin to work around datasets exception in the docbuilder.Remove after docker images and main have
+      # the right dependencies (which **should** be the case by 2025-07-20). See
+      # https://github.com/huggingface/transformers/actions/runs/16365952006/job/46243081358?pr=38545
+      pre_command: uv pip install datasets>=2.15.0
     secrets:
       token: ${{ secrets.HUGGINGFACE_PUSH }}
       hf_token: ${{ secrets.HF_DOC_BUILD_PUSH }}

.github/workflows/build_pr_documentation.yml

@@ -15,6 +15,7 @@ jobs:
       pr_number: ${{ github.event.number }}
       package: transformers
       languages: en
-      # temporary pin to work around datasets exception in the docbuilder. See
+      # Temporary pin to work around datasets exception in the docbuilder. Remove after docker images and main have
+      # the right dependencies (which **should** be the case by 2025-07-20). See
       # https://github.com/huggingface/transformers/actions/runs/16365952006/job/46243081358?pr=38545
-      pre_command: uv pip install pyarrow==20.0.0
+      pre_command: uv pip install datasets>=2.15.0