chore(deps): update ghcr.io/vexxhost/openstack-venv-builder:2026.1 docker digest to b210036 (#739)

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

Dockerfile

@@ -2,7 +2,7 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 # Atmosphere-Rebuild-Time: 2024-06-25T22:49:25Z
 
-FROM ghcr.io/vexxhost/openstack-venv-builder:2026.1@sha256:eda747cf3cc6f5d44c2050aeeffd595860b5a30f4fdf3c197d9612d6212e7302 AS build
+FROM ghcr.io/vexxhost/openstack-venv-builder:2026.1@sha256:b21003659f31869a149a2f978e8bc33c38927e4325eebdd4825ffb1c75efc2f0 AS build
 RUN <<EOF bash -xe
 uv pip install \
     --constraint /upper-constraints.txt \