Time moves on and the ages in these examples are no longer valid. These
changes replace static ages with calculated equivalents so that they can
be rerun at any time with confidence.

See: https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file#configuration-options-for-the-dependabotyml-file

Dependabot: Manage GitHub Actions updates

Gemspec/DevelopmentDependencies: Specify development dependencies in
Gemfile.

Pull test case out of setup.

- Remove Ruby 2.6: rubocop >= 1.51.0 depends on Ruby >= 2.7.0
- Add modern, generally available Ruby versions: 3.2, 3.3

Style/SuperArguments: Call super without arguments and parentheses when
the signature is identical.

Style/RedundantInterpolation: Prefer to_s over string interpolation.

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 2 to 4.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v2...v4)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Examples: time aware passenger ages

See: https://duffel.com/docs/api/v1/cities

- Style/SuperArguments: Call super without arguments and parentheses
  when the signature is identical.
- Layout/EmptyLinesAroundBlockBody: Extra empty line detected at block
  body end. (https://rubystyle.guide#empty-lines-around-bodies)