Use python 3.12 in test.yml workflow, to fix the documentation and the UI test

Author: brichet

.github/workflows/tests.yml

@@ -11,7 +11,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
-          python-version: '3.13'
+          python-version: '3.12'
           cache: 'pip'
           cache-dependency-path: |
             **/setup.cfg
@@ -34,7 +34,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
-          python-version: 3.8
+          python-version: '3.12'
           cache: 'pip'
           cache-dependency-path: |
             **/setup.cfg
@@ -108,7 +108,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
-          python-version: 3.8
+          python-version: '3.12'
           cache: 'pip'
           cache-dependency-path: |
             **/setup.cfg
@@ -135,7 +135,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
-          python-version: '3.13'
+          python-version: '3.12'
           cache: 'pip'
           cache-dependency-path: |
             **/setup.cfg