chore(deps): update ghcr.io/vexxhost/openstack-venv-builder:main docker digest to 3c9397b (main)

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ghcr.io/vexxhost/openstack-venv-builder	stage	digest	77ccb10 → 3c9397b

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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:271f657

Digest: ghcr.io/vexxhost/python-openstackclient@sha256:ea4b8ea1cc14ce8b9e00d5d9db77c586a1d383c9cac86204c5929c23f229008d