CI: Force python version 3.12

There are occasionally setup failures that happen with some of the
github worker images using python 3.11.  Fix this by always using 3.12
of python.

Signed-off-by: David Brown <[email protected]>

Author: d3zd3z

.github/workflows/build.yml

@@ -36,7 +36,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version: 3.11
+          python-version: 3.12
 
       - name: Setup Zephyr project
         uses: zephyrproject-rtos/action-zephyr-setup@v1

.github/workflows/docs.yml

@@ -26,7 +26,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version: 3.11
+          python-version: 3.12
 
       - name: Setup Zephyr project
         uses: zephyrproject-rtos/action-zephyr-setup@v1