chore(deps): update ghcr.io/vexxhost/openstack-venv-builder:2026.1 docker digest to efff8d8 (stable/2026.1)

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ghcr.io/vexxhost/openstack-venv-builder	stage	digest	4015712 → efff8d8

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

ghcr.io/vexxhost/python-openstackclient:2026.1
ghcr.io/vexxhost/python-openstackclient:stable-2026.1
ghcr.io/vexxhost/python-openstackclient:aebb351
ghcr.io/vexxhost/python-openstackclient:latest

Digest: ghcr.io/vexxhost/python-openstackclient@sha256:bac0e8a2238d097ab8ab560556c9b74d1246bacb9ef76e2a4059adf4b3c77f6e