chore(deps): update ghcr.io/vexxhost/openstack-venv-builder:2025.2 docker digest to 6d7e939 (stable/2025.2)

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ghcr.io/vexxhost/openstack-venv-builder	stage	digest	ca30a10 → 6d7e939

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

ghcr.io/vexxhost/python-openstackclient:2025.2
ghcr.io/vexxhost/python-openstackclient:stable-2025.2
ghcr.io/vexxhost/python-openstackclient:c5e462b
ghcr.io/vexxhost/python-openstackclient:latest

Digest: ghcr.io/vexxhost/python-openstackclient@sha256:76aa42ec7cefca7c32de92fd4447ff7071a923067698c5f65e6b83d2c4365c2a