docker : force Python 3.13 in Vulkan container (#20530)

* ci: force Python 3.13 in Vulkan container

* remove unnecessary `update-alternatives` line

Author: gguillemas

.devops/vulkan.Dockerfile

@@ -53,10 +53,11 @@ RUN apt-get update \
     && apt-get install -y \
     build-essential \
     git \
-    python3 \
-    python3-dev \
+    python3.13 \
+    python3.13-dev \
     python3-pip \
     python3-wheel \
+    && update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.13 100 \
     && pip install --break-system-packages --upgrade setuptools \
     && pip install --break-system-packages -r requirements.txt \
     && apt autoremove -y \