fix test on push

.github/workflows/convert-model.yml

@@ -60,6 +60,7 @@ jobs:
 
       - name: Install dependencies
         run: |
+          python.exe -m ensurepip
           python.exe -m pip install --upgrade pip
           pip install huggingface_hub==0.23.3 hf-transfer fire numpy==1.26.4 torch==2.3.1 transformers==4.43.4 onnx==1.16.1 onnxruntime==1.18.0 sentencepiece==0.2.0