Allow `Async::HTTP::Internet` methods to accept `URI::HTTP` objects.

[postmodern]

URI::HTTP objects do not define a to_str method, so call to_s on the uri instead.

Types of Changes

• Bug fix.

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.

[ioquatix]

This seems reasonable to me, but I just wonder why it was to_str in the first place.

[ioquatix]

Thanks for your contribution.