[misc] Update PyTorch version in docs (#5724)

* [misc] Update PyTorch version in docs

* [misc] Update PyTorch version in docs

README.md

@@ -418,7 +418,7 @@ Please visit our [documentation](https://www.colossalai.org/) and [examples](htt
 ## Installation
 
 Requirements:
-- PyTorch >= 1.11 and PyTorch <= 2.1
+- PyTorch >= 2.1
 - Python >= 3.7
 - CUDA >= 11.0
 - [NVIDIA GPU Compute Capability](https://developer.nvidia.com/cuda-gpus) >= 7.0 (V100/RTX20 and higher)

docs/README-zh-Hans.md

@@ -413,7 +413,7 @@ Colossal-AI 为您提供了一系列并行组件。我们的目标是让您的
 
 环境要求:
 
-- PyTorch >= 1.11 并且 PyTorch <= 2.1
+- PyTorch >= 2.1
 - Python >= 3.7
 - CUDA >= 11.0
 - [NVIDIA GPU Compute Capability](https://developer.nvidia.com/cuda-gpus) >= 7.0 (V100/RTX20 and higher)