chore(deps): update ghcr.io/vexxhost/openstack-venv-builder:2025.2 docker digest to d6c9011 (stable/2025.2)

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ghcr.io/vexxhost/openstack-venv-builder	stage	digest	3aa2a14 → d6c9011

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

ghcr.io/vexxhost/python-openstackclient:2025.2
ghcr.io/vexxhost/python-openstackclient:stable-2025.2
ghcr.io/vexxhost/python-openstackclient:19b4dbd
ghcr.io/vexxhost/python-openstackclient:latest

Digest: ghcr.io/vexxhost/python-openstackclient@sha256:8034da0dc6c587e5477ab44b44f1137edc4d04e3685a68c703458b9c41b6372b