Gemfile: Use current Rails and sqlite3, complying with the spirit of the code comment

[olleolleolle]

This fails some output-related tests, but we will deal with those changes.

[brunofacca]

Thank you. Is this ready to merge?

[olleolleolle]

@brunofacca No, sadly not, it's a little sad about Gemfile.lock details.

[brunofacca]

Sorry, but can you please elaborate?

[olleolleolle]

1. The build has fail-fast, so we don’t currently see all the builds.
2. The ruby-head build fails like this:

The following platform specific gems are getting installed, yet the lockfile includes only their generic ruby version:
 * sqlite3-2.8.0-x86_64-linux-gnu
 * nokogiri-1.18.10-x86_64-linux-gnu
Please run `bundle lock --normalize-platforms` and commit the resulting lockfile.
Alternatively, you may run `bundle lock --add-platform <list-of-platforms-that-you-want-to-support>`
nokogiri-1.18.10-x86_64-linux-gnu requires ruby version < 3.5.dev, >= 3.1, which
is incompatible with the current version, 4.0.0.dev

So, platforms fixing. And perhaps setting the fail-fast: false on the strategy.

[brunofacca]

Hey. Sorry, I was away for a while.
Thank you for the explanation. Do you plan on doing any more work on this PR or should we close it?

[olleolleolle]

Ah, thank you, this has been superseded by #79. Closing!