chore(deps): update ghcr.io/vexxhost/openstack-venv-builder:main docker digest to c8e3b9b (stable/2026.1)

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ghcr.io/vexxhost/openstack-venv-builder	stage	digest	c912ab8 → c8e3b9b

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

ghcr.io/vexxhost/python-openstackclient:2026.1
ghcr.io/vexxhost/python-openstackclient:stable-2026.1
ghcr.io/vexxhost/python-openstackclient:985e5b5
ghcr.io/vexxhost/python-openstackclient:latest

Digest: ghcr.io/vexxhost/python-openstackclient@sha256:f3224c24691a80471a02b1141e2136f5ee87fe614e1fec05c80088758560c283