ci/vkd3d: fail job when failing to get driver version

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29201>

.gitlab-ci/vkd3d-proton/run.sh

@@ -42,6 +42,7 @@ set +e
 if ! vulkaninfo | tee /tmp/version.txt | grep -F "Mesa $MESA_VERSION";
 then
     printf "%s\n" "Found $(cat /tmp/version.txt), expected $MESA_VERSION"
+    exit 1
 fi
 set -e