chore(deps): update ghcr.io/vexxhost/openstack-venv-builder:2025.1 docker digest to 56c6998 (stable/2025.1)

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ghcr.io/vexxhost/openstack-venv-builder	stage	digest	6dad051 → 56c6998

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renovate[bot]
This pull request has been included in the following image tags:

ghcr.io/vexxhost/python-openstackclient:2025.1
ghcr.io/vexxhost/python-openstackclient:stable-2025.1
ghcr.io/vexxhost/python-openstackclient:4dde4e9
ghcr.io/vexxhost/python-openstackclient:latest

Digest: ghcr.io/vexxhost/python-openstackclient@sha256:d83dbe474f64ccf13d3d241b74810cd8e599a89f87e45a9aaae1d0e13dee9a79