Update dependabot support status (#13690)
Following user reports and
https://github.com/dependabot/dependabot-core/issues?q=state%3Aopen%20label%3A%22L%3A%20python%3Auv%22%20sort%3Areactions-%2B1-desc,
we're updating the dependabot support as partial.
See https://github.com/astral-sh/uv/issues/2512#issuecomment-2900063741
