Align Dependabot coverage with the estate baseline

[leynos]

Summary

This branch applies Wave 1 of the Rust estate baseline remediation
(Operation Parabellum, phase 2). It aligns
.github/dependabot.yml
with the canonical Dependabot reference: one update stanza per package
ecosystem the repository uses (cargo, uv, github-actions), each stanza labelled
dependencies plus its channel label, and GitHub Actions updates batched
into a single pull request via a wildcard group.

Review walkthrough

• Start with
  .github/dependabot.yml
  for the ecosystem coverage and labels.

Validation

• Audited the amended tree with the Concordat rule packages
  dependabot-baseline and rust-dev-fast-baseline: dependabot-baseline compliant, rust-dev-fast-baseline indeterminate.

Notes

• The canonical labels (including the Dependabot channel labels this
  configuration references) were created on the repository ahead of this
  pull request, so no stanza names a missing label.

Summary by Sourcery

Enhancements:

• Add the uv ecosystem label to Python dependency updates in Dependabot configuration to match baseline labelling.

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Aligns the repository’s Dependabot configuration with the Rust estate baseline by ensuring each ecosystem has appropriate dependency/channel labels, specifically adding the missing uv label to the Python/uv update stanza.

File-Level Changes

Change	Details	Files
Add the uv channel label to the Dependabot update stanza for the Python/uv ecosystem to align with the canonical baseline configuration.	Extend the label set for the Python dependency update stanza to include the uv channel label alongside existing dependency labels. Preserve existing schedule and cooldown configuration while only modifying labels to match the canonical Dependabot reference.	.github/dependabot.yml

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