Update ghcr.io/code0-tech/cygnus Docker tag to v1991

[renovate]

This PR contains the following updates:

Package	Type	Change
ghcr.io/code0-tech/cygnus	docker_registry_image	1803 → 1991

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[github-actions]

GitLab Pipeline Action

General information

Link to pipeline: https://gitlab.com/code0-tech/infrastructure/mensa/-/pipelines/2797982593

Status: Passed
Duration: 2 minutes

Job summaries

tf-plan:server_production

No changes. Your infrastructure matches the configuration.

tf-plan:server_administration

Plan: 2 to add, 0 to change, 2 to destroy.

tf-plan:github

No changes. Your infrastructure matches the configuration.

tf-plan:main

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