chore: auto-close stale "waiting for info" items with Carson's no-response-closer

[paulbalandan]

Description
Adds a second no-response-closer rule so items labelled waiting for info are closed automatically when the author stops responding, and bumps Carson to v1.7.0 for the option that makes this safe.

The label is used on both issues and PRs: 68 closed issues and 30 closed PRs carry it, and 27 of those PRs were closed unmerged, by hand, after the author went quiet. This takes over that chore.

How it behaves:

• When the item's author comments, or pushes to their PR, Carson removes waiting for info. The item then drops out of the sweep, so an answered item is never closed for lack of a response.
• A comment from anyone else, including a maintainer's follow-up, does not remove the label. It only delays the close, since the timer runs on the item's last activity.
• If the label is still on after 14 days without activity, the daily run closes the item with a comment inviting the author to reply so a maintainer can reopen it. With the run at 00:00 UTC, the close lands between 14 and 15 days after the last activity.
• Any reply from the author clears the label, even one that does not answer the question. Re-apply the label to restart the clock.

The needs template rule is unchanged and does not use unlabel_on_response. template-enforcer already removes that label once the description complies, and a comment should not rescue an issue that still skips the template.

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value (without duplication)
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide