fix(ci): use Python 3.12 in Zephyr job — v4.4.0 CMake requires >=3.12

Co-Authored-By: Oz <oz-agent@warp.dev>

Author: tbitcs

.github/workflows/ci.yml

@@ -70,7 +70,7 @@ jobs:
 
       - uses: actions/setup-python@v5
         with:
-          python-version: "3.11"
+          python-version: "3.12"
 
       - name: Install west
         run: pip install west