Allow Interrupt to retry the run loop after issuing #stop.

[ioquatix]

Ctrl-C should allow for graceful clean-up. This behaviour is probably also more compatible with Async 1.x.

Fixes https://github.com/socketry/async/issues/291

Types of Changes

• Bug fix.
• New feature.

Contribution

• [x] I added tests for my changes.
• [x] I tested my changes locally.
• [x] I agree to the Developer's Certificate of Origin 1.1.