chore(deps): update ghcr.io/vexxhost/openstack-venv-builder:2025.2 docker digest to b9a1907 (stable/2025.2)

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ghcr.io/vexxhost/openstack-venv-builder	stage	digest	27a74a3 → b9a1907

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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:ea5aba4
ghcr.io/vexxhost/python-openstackclient:latest

Digest: ghcr.io/vexxhost/python-openstackclient@sha256:08b38532052aabea38f7b31c3bbcd00c99010ec2e86374144ce7cc943244fb43