chore(deps): update ghcr.io/vexxhost/openstack-venv-builder:2023.2 docker digest to a3c100c (stable/2023.2)

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ghcr.io/vexxhost/openstack-venv-builder	stage	digest	8d55faf → a3c100c

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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:d9712ee
ghcr.io/vexxhost/python-openstackclient:latest

Digest: ghcr.io/vexxhost/python-openstackclient@sha256:49105c9cd5ed8c8eb0d164183792416748cb250bb7ad706df425bfd5bb22ce12