Relax json_schemer dependency, add ostruct explicitly

[djordjelacmanovic]

Relax json_schemer version so gems (e.g. activerecord_json_validator) that depend on it can be updated. Needed for Rails 8 updates.

After merge and release of new version update https://github.com/infinum/rails-infinum-guess_who/pull/353 to remove the dependency on GitHub ref.

Related issue: #1196

[vr4b4c]

I have a vague recollection about JSON schema resolution issues from the past. Are you sure request specs on the existing projects are green with this change (one example is enough)?

[djordjelacmanovic]

I have a vague recollection about JSON schema resolution issues from the past. Are you sure request specs on the existing projects are green with this change (one example is enough)?

Yes, see https://github.com/infinum/rails-infinum-guess_who/pull/353, there are multiple match_response_schema uses in tests and that PR is on json_schemer (2.4.0) with

gem 'infinum_json_api_setup', github: 'infinum/infinum-json-api-setup', ref: '346fa0dc203a413c43ea5d9b4139cf3cd874301c'

[djordjelacmanovic]

Also pulled in ostruct as explicit dependency in eb01b80, required for Ruby 3.4+ support (deprecated and not loaded by default in Ruby 3.4, removed in 3.5)

OpenStruct usages InfinumJsonApiSetup::Rspec::Helpers::ResponseHelper were not covered by specs so we didn't have a failing test case. Will need to add those in too.