Pin transformers version to work around latest torch requirements (#6759)

Latest transformers seems to break our tests that aren't on torch latest
(>= 2.5). Issue opened here:
https://github.com/huggingface/transformers/issues/34795. This pins our
version so these tests can pass in the meantime.

.github/workflows/hpu-gaudi2.yml

@@ -111,6 +111,7 @@ jobs:
         run: |
           git clone https://github.com/huggingface/transformers
           cd transformers
+          git checkout 7df93d6ffb48946e532c7d766fe10372e98d78b6
           git rev-parse --short HEAD
           pip install .
 

.github/workflows/nv-a6000.yml

@@ -40,8 +40,9 @@ jobs:
           python -c "import torch; print('CUDA available:', torch.cuda.is_available())"
       - name: Install transformers
         run: |
-          git clone --depth=1 https://github.com/huggingface/transformers
+          git clone https://github.com/huggingface/transformers
           cd transformers
+          git checkout 7df93d6ffb48946e532c7d766fe10372e98d78b6
           git rev-parse --short HEAD
           python -m pip install .
       - name: Install deepspeed