chore(deps): update ghcr.io/vexxhost/openstack-venv-builder:2023.2 docker digest to 944915b (stable/2023.2)

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ghcr.io/vexxhost/openstack-venv-builder	stage	digest	a6e0121 → 944915b

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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:5499cfd
ghcr.io/vexxhost/python-openstackclient:latest

Digest: ghcr.io/vexxhost/python-openstackclient@sha256:7beaaf6d889fae307e008b5e2b406d1a77a62229f12a0da9ca3dd326e6aa2d00