chore(deps): update ghcr.io/vexxhost/openstack-venv-builder:2023.1 docker digest to a991466 (stable/2023.1)

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ghcr.io/vexxhost/openstack-venv-builder	stage	digest	5ac6030 → a991466

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

ghcr.io/vexxhost/python-openstackclient:2023.1
ghcr.io/vexxhost/python-openstackclient:stable-2023.1
ghcr.io/vexxhost/python-openstackclient:5ae90e1
ghcr.io/vexxhost/python-openstackclient:latest

Digest: ghcr.io/vexxhost/python-openstackclient@sha256:cd234f0451b43653cb9f010387ab493c36354da2df745bfee9dad5d279dcb750