Fix codegeex2 transformers version (#11487)

python/llm/example/CPU/HF-Transformers-AutoModels/Model/codegeex2/README.md

@@ -18,6 +18,7 @@ conda activate llm
 
 # install the latest ipex-llm nightly build with 'all' option
 pip install --pre --upgrade ipex-llm[all] --extra-index-url https://download.pytorch.org/whl/cpu
+pip install transformers==4.31.0
 ```
 
 On Windows:
@@ -27,6 +28,7 @@ conda create -n llm python=3.11
 conda activate llm
 
 pip install --pre --upgrade ipex-llm[all]
+pip install transformers==4.31.0
 ```
 
 ### 2. Run

python/llm/example/CPU/PyTorch-Models/Model/codegeex2/README.md

@@ -18,6 +18,7 @@ conda activate llm
 
 # install the latest ipex-llm nightly build with 'all' option
 pip install --pre --upgrade ipex-llm[all] --extra-index-url https://download.pytorch.org/whl/cpu
+pip install transformers==4.31.0
 ```
 
 On Windows:
@@ -27,6 +28,7 @@ conda create -n llm python=3.11
 conda activate llm
 
 pip install --pre --upgrade ipex-llm[all]
+pip install transformers==4.31.0
 ```
 
 ### 2. Run

python/llm/example/GPU/HF-Transformers-AutoModels/Model/codegeex2/README.md

@@ -16,6 +16,7 @@ conda create -n llm python=3.11
 conda activate llm
 # below command will install intel_extension_for_pytorch==2.1.10+xpu as default
 pip install --pre --upgrade ipex-llm[xpu] --extra-index-url https://pytorch-extension.intel.com/release-whl/stable/xpu/us/
+pip install transformers==4.31.0
 ```
 
 #### 1.2 Installation on Windows
@@ -26,6 +27,7 @@ conda activate llm
 
 # below command will install intel_extension_for_pytorch==2.1.10+xpu as default
 pip install --pre --upgrade ipex-llm[xpu] --extra-index-url https://pytorch-extension.intel.com/release-whl/stable/xpu/us/
+pip install transformers==4.31.0
 ```
 
 ### 2. Configures OneAPI environment variables for Linux

python/llm/example/GPU/PyTorch-Models/Model/codegeex2/README.md

@@ -16,6 +16,7 @@ conda create -n llm python=3.11
 conda activate llm
 # below command will install intel_extension_for_pytorch==2.1.10+xpu as default
 pip install --pre --upgrade ipex-llm[xpu] --extra-index-url https://pytorch-extension.intel.com/release-whl/stable/xpu/us/
+pip install transformers==4.31.0
 ```
 
 #### 1.2 Installation on Windows
@@ -26,6 +27,7 @@ conda activate llm
 
 # below command will install intel_extension_for_pytorch==2.1.10+xpu as default
 pip install --pre --upgrade ipex-llm[xpu] --extra-index-url https://pytorch-extension.intel.com/release-whl/stable/xpu/us/
+pip install transformers==4.31.0
 ```
 
 ### 2. Configures OneAPI environment variables for Linux