github: workflows: Use same python version as upstream

Use python 3.12 which is what upstream CI uses currently.

Signed-off-by: Johan Hedberg <[email protected]>

Author: jhedberg

.github/workflows/build.yml

@@ -20,7 +20,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version: 3.13
+          python-version: 3.12
 
       - name: Setup Zephyr project
         uses: zephyrproject-rtos/action-zephyr-setup@v1

.github/workflows/compliance.yml

@@ -40,7 +40,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v5
       with:
-        python-version: 3.13
+        python-version: 3.12
 
     - name: Setup Zephyr project
       uses: zephyrproject-rtos/action-zephyr-setup@v1

.github/workflows/upstream-build.yml

@@ -16,7 +16,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version: 3.13
+          python-version: 3.12
 
       - name: Update manifest to point at upstream main branch
         working-directory: zephyr-silabs