ci: cancel in-flight download-index runs when a new one starts

[igorpecovnik]

Summary

One-line concurrency tweak on `data-update-download-index.yml`:

```diff
concurrency:
group: ${{ github.workflow }}

• cancel-in-progress: false

• cancel-in-progress: true
  ```

Why

A fresh trigger (SDK build dispatch, release publish, manual retry) currently has to wait behind any older run still mid-rsync against `fi.mirror.armbian.de`. Two consequences:

• The mirror connection from the stale run stays open for its full duration — wasted slot.
• If a slow run eventually finishes after a newer one was queued, yesterday's index can land over today's.

Cancelling the in-flight run on every new trigger preempts both: the freshest data wins, and the rsync slot frees immediately.

The commit step at the bottom of the job writes `armbian-images.json` + `all-torrents.zip` atomically to the `data` branch — a cancelled run leaves nothing half-written.

Test plan

• Trigger `Data: Generate Armbian download index` manually, then trigger it again before the first finishes; confirm the older run shows "Cancelled" in the run list.
• Confirm the newer run completes and lands a fresh `armbian-images.json` on `data`.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 451e92ee-1e4e-4334-802e-50747c6a1def

📥 Commits

Reviewing files that changed from the base of the PR and between 1e0c028 and 5c7607b.

📒 Files selected for processing (1)

• .github/workflows/data-update-download-index.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch cancel-running-download-index

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