chore(deps): update ghcr.io/vexxhost/openstack-venv-builder:main docker digest to b8fb05f (main)

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ghcr.io/vexxhost/openstack-venv-builder	stage	digest	2860ac4 → b8fb05f

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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:277eff5

Digest: ghcr.io/vexxhost/python-openstackclient@sha256:39de3e8dd770bd927a40d51e73354f7e0fcb8464391796488dfc1cfddfd7f81b