Add workflow that fails when Dependabot updates error

[horgh]

Add a weekly scheduled workflow that fails when any "Dependabot Updates" run concluded with failure, startup_failure, or timed_out in the last 8 days, so a silently-broken Dependabot ecosystem surfaces as a red scheduled run that emails a human instead of only a red triangle in the Dependabot tab that nobody checks.

This is a copy of the reference change in maxmind/device-android#61, adjusted to run on Wednesdays and to also treat timed_out as a failure.

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• .github/workflows/dependabot-failure-watcher.yml

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Pull request overview

Adds a scheduled GitHub Actions workflow to actively surface broken “Dependabot Updates” runs by failing on a weekly schedule when recent Dependabot update runs have concluded unsuccessfully, ensuring failures generate a visible red run (and associated notifications) instead of being easy to miss in the Dependabot UI.

Changes:

• Introduces a weekly (Wednesday) scheduled workflow plus manual dispatch trigger.
• Uses the GitHub CLI to query recent “Dependabot Updates” workflow runs and fails if any concluded with failure, startup_failure, or timed_out.

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