Fix PyTorch 2.8 images (#5490)

* pin spacy version to fix package regression in PyTorch 2.8 images

Author: jinyan-li1

pytorch/training/docker/2.8/py3/Dockerfile.cpu

@@ -206,7 +206,7 @@ RUN pip install --no-cache-dir -U torch==${PYTORCH_VERSION} \
     accelerate \
     # pin numpy requirement for fastai dependency
     # requires explicit declaration of spacy, thic, blis
-    spacy \
+    spacy==3.8.7 \
     # pin thinc due to incompatibility with numpy 1.26.4 (sagemaker doesn't support latest numpy)
     thinc==8.3.4  \
     blis \

pytorch/training/docker/2.8/py3/cu129/Dockerfile.gpu

@@ -126,7 +126,7 @@ RUN pip install --no-cache-dir -U torch==${PYTORCH_VERSION} \
     accelerate \
     # pin numpy requirement for fastai dependency
     # requires explicit declaration of spacy, thic, blis
-    spacy \
+    spacy==3.8.7 \
     # pin thinc due to incompatibility with numpy 1.26.4 (sagemaker doesn't support latest numpy)
     thinc==8.3.4 \
     blis \