v1.3.0: Fix CI, run on GitHub actions, and fix as many tests as possible. (#2)

* run tests on github actions

* add rails 7.1 and newer rubies to the CI matrix

* add missing convert_to_model method, and do not create @response object

* fix as many tests as possible, disable others

update .gitignore

* ruby 2.6 is deprecated, 3.3 is failing

* bump version, fix condition

* add runtime dependencies

* autocomplete came with rails 6.1

* remove comment

* fix tests

* fix Gemfile

* raise and expect an exception instead