chore(deps): update ghcr.io/vexxhost/openstack-venv-builder:2023.2 docker digest to a6e0121 (stable/2023.2)

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ghcr.io/vexxhost/openstack-venv-builder	stage	digest	d575a3b → a6e0121

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

ghcr.io/vexxhost/python-openstackclient:2023.2
ghcr.io/vexxhost/python-openstackclient:stable-2023.2
ghcr.io/vexxhost/python-openstackclient:68ca7e5
ghcr.io/vexxhost/python-openstackclient:latest

Digest: ghcr.io/vexxhost/python-openstackclient@sha256:28ceef293544db21a4604d9e545c5cb04a921f9d83f19f10c84f2807263a4578