ci: update python version for build and publish workflows

- bump python version to 3.12 in build workflow
- update python version to 3.12 in publish workflow

.github/workflows/python-build.yml

@@ -13,7 +13,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v5
       with:
-        python-version: '3.11' # avoid bugs in new versions
+        python-version: '3.12' # avoid bugs in new versions
         cache: 'pip'
         cache-dependency-path: pyproject.toml
 

.github/workflows/python-publish.yml

@@ -26,7 +26,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v3
       with:
-        python-version: '3.x'
+        python-version: '3.12'
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip