chore(deps): update ghcr.io/vexxhost/openstack-venv-builder:2023.2 docker digest to c31c9ce (stable/2023.2)

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ghcr.io/vexxhost/openstack-venv-builder	stage	digest	84bd94a → c31c9ce

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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:073efae
ghcr.io/vexxhost/python-openstackclient:latest

Digest: ghcr.io/vexxhost/python-openstackclient@sha256:965a1676b4bd7620bdf95322d7a3274460433df50d24b62d9a6c376facf460a4