chore(deps): update ghcr.io/vexxhost/openstack-venv-builder:2023.2 docker digest to 42fb73f (stable/2023.2)

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ghcr.io/vexxhost/openstack-venv-builder	stage	digest	c31c9ce → 42fb73f

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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:0957cca
ghcr.io/vexxhost/python-openstackclient:latest

Digest: ghcr.io/vexxhost/python-openstackclient@sha256:ad6590fe581c9c0e3d42915734a662ec25ad5b980ec2c0f7d70f8de89d6d8a4b