fix the CI running errors in tests. (PaddlePaddle#13846)

.github/workflows/tests.yaml

@@ -51,7 +51,7 @@ jobs:
         python -m pip install --upgrade pip
         pip install pytest
         if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
-        pip install paddlepaddle==0.0.0 -f https://www.paddlepaddle.org.cn/whl/linux/cpu-mkl/develop.html
+        python -m pip install paddlepaddle==3.0.0b1 -i https://www.paddlepaddle.org.cn/packages/stable/cpu/
         pip install -e .
     - name: Test with pytest
       run: |