Refactor web APIs to phpgt/http

This release refactors the web API classes used in this repository into the upstream phpgt/http library.

What's Changed

• Bump phpunit/phpunit from 9.5.21 to 9.5.28 by @dependabot in #101
• maintenance: dependabot by @g105b in #98
• Promise simplify by @g105b in #144
• Improvements to CI by @g105b in #145
• Allow "redirect: error" option by @g105b in #147
• feature: post data with formdata by @g105b in #149
• FormData posts and uploads by @g105b in #151

New Contributors

• @dependabot made their first contribution in #101

Full Changelog: v1.1.0...v1.1.1