chore(deps): update ghcr.io/vexxhost/openstack-venv-builder:main docker digest to 88b5f72 (main)

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ghcr.io/vexxhost/openstack-venv-builder	stage	digest	c28dba9 → 88b5f72

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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:d1e070c

Digest: ghcr.io/vexxhost/python-openstackclient@sha256:9dc9445d0024b49b5b0d1ea26bbcd3855a96593eb934ad69971bb2856e54d14c