chore(deps): update ghcr.io/vexxhost/openstack-venv-builder:2025.2 docker digest to b5fab55 (#766)

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: 2025-10-14T10:18:12Z
 
-FROM ghcr.io/vexxhost/openstack-venv-builder:2025.2@sha256:6e11ce8bb251b21bab0abb8264b8a725656dac6b622c0554fb7dcf6eeb558156 AS build
+FROM ghcr.io/vexxhost/openstack-venv-builder:2025.2@sha256:b5fab55222cac6a941f449dc7dab1a9fa669d2eb0f105cda0397b44c36ffca00 AS build
 RUN <<EOF bash -xe
 uv pip install \
     --constraint /upper-constraints.txt \