chore(deps): update ghcr.io/vexxhost/openstack-venv-builder:2024.2 docker digest to 9708c07 (stable/2024.2)

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ghcr.io/vexxhost/openstack-venv-builder	stage	digest	b97d876 → 9708c07

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

ghcr.io/vexxhost/python-openstackclient:2024.2
ghcr.io/vexxhost/python-openstackclient:stable-2024.2
ghcr.io/vexxhost/python-openstackclient:2ea43e7
ghcr.io/vexxhost/python-openstackclient:latest

Digest: ghcr.io/vexxhost/python-openstackclient@sha256:4e8b5300568dabfcac1283b64d9d721dd6a552f37d8402d8b761f074005eeb83