chore(deps): update ghcr.io/vexxhost/openstack-venv-builder:main docker digest to c912ab8 (main)

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ghcr.io/vexxhost/openstack-venv-builder	stage	digest	d47d2e2 → c912ab8

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

ghcr.io/vexxhost/python-openstackclient:main
ghcr.io/vexxhost/python-openstackclient:latest
ghcr.io/vexxhost/python-openstackclient:380a5fa

Digest: ghcr.io/vexxhost/python-openstackclient@sha256:b5b9ac614c2f9256dd87cf1939b4a49db8e5b9c6f6a871565744b743815458b1