The build-images CI job failed because GitHub releases dropped
connections ("Remote end closed connection without response") for
actionlint, vale, and hadolint simultaneously. The previous code only
fell through to the next fallback URL — there was no retry on the same
URL for transient connection resets.
Now uses tenacity.Retrying with exponential backoff (2-10s, 3 attempts)
on URLError/OSError/ConnectionError, matching the pattern already used
in devx.utils.network. The _sleep kwarg allows tests to skip real
sleeping.
3 new tests cover: retry-then-success, exhaustion-after-max-retries,
and no-retry-on-non-transient-errors.
Generated with [Devin](https://devin.ai)
Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
