update python version

Author: xiaobinqt

.github/workflows/ci.yml

@@ -121,7 +121,7 @@ jobs:
       - name: set up python
         uses: actions/setup-python@v3
         with:
-          python-version: '3.x' # Version range or exact version of a Python version to use, using SemVer's version range syntax
+          python-version: '3.12' # Version range or exact version of a Python version to use, using SemVer's version range syntax
           architecture: 'x64' # optional x64 or x86. Defaults to x64 if not specified
 
       - name: python 脚本，先删除索引再重新上传索引， gitalk issue init