chore(deps): update ghcr.io/vexxhost/openstack-venv-builder:main docker digest to 503673a (#68)

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:main@sha256:c5db9965f58d33f20b00f81e903c51d2f9a9629cb5cf56cca4c47d543030404b AS build
+FROM ghcr.io/vexxhost/openstack-venv-builder:main@sha256:503673a4f3ccd9d9dacef889da7321d8fe918c927f7d8a74df9033bb3b6bf0d3 AS build
 RUN <<EOF bash -xe
 uv pip install \
     --constraint /upper-constraints.txt \