chore(deps): update ghcr.io/vexxhost/openstack-venv-builder:2023.2 docker digest to 4d28162 (stable/2023.2)

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ghcr.io/vexxhost/openstack-venv-builder	stage	digest	a126e95 → 4d28162

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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:fa05e60
ghcr.io/vexxhost/python-openstackclient:latest

Digest: ghcr.io/vexxhost/python-openstackclient@sha256:3b8e493a96d4d898f24947fe5d7e68acb9adc52fcced2531b6a952fef832c13f