chore(deps): update ghcr.io/defenseunicorns/packages/uds/gitlab-runner docker tag to v17.2.1-uds.6-registry1

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
ghcr.io/defenseunicorns/packages/uds/gitlab-runner	minor	17.1.0-uds.1-registry1 -> 17.2.1-uds.6-registry1

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