chore(deps): pin vexxhost/docker-atmosphere action to 9dc904e (stable/2025.2)

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
vexxhost/docker-atmosphere	action	pinDigest	→ 9dc904e

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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:84e896a
ghcr.io/vexxhost/python-openstackclient:latest

Digest: ghcr.io/vexxhost/python-openstackclient@sha256:5d912c471a1face29e7d82e118913d68d03b3d384200d167db9e8cea46bc0bc2