Allows Rails 8, updates sqlite in Gemfile to match what CI runs

[rjacoby]

Summary

Bumps Gemfile and solidus_core.gemspec up to support Rails 8.0. Makes minor changes to update code and tests to deal with Rails 8 changes.

This required bumping sqlite3 above 2.0 to get specs to pass; note that the circleci config already required this and was not testing Rails 7.0 for sqlite likely due to this compatibility mismatch.

Checklist

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[rjacoby]

@tvdeyen I've got all the tests passing locally, on all 3 databases. Seems like test flake on that one circle run, but I don't have perms to rerun it.

[kennyadsl]

@rjacoby Thank you! re-running specs, I left a question, let me know what you think about it.

[rjacoby]

@kennyadsl Updated with your suggestion.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.70%. Comparing base (ca1ae4d) to head (0e9bd91).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6091      +/-   ##
==========================================
- Coverage   92.42%   88.70%   -3.73%     
==========================================
  Files         389      829     +440     
  Lines        8005    17992    +9987     
==========================================
+ Hits         7399    15959    +8560     
- Misses        606     2033    +1427     

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[tvdeyen]

Thanks. Very much appreciated. Would you mind to rebase with main (and not merge) and squash the fixup into the introducing commit?

[tvdeyen]

@rjacoby Rubocop needs your attention as well 🙏🏻

[fthobe]

OMG, this is happening much sooner than expected. Thank you so much guys.

[rjacoby]

@tvdeyen Rebased, but now the project's codecov isn't happy...

[kushp]

nice

[tvdeyen]

Thanks.